# Questions Asked onFebruary 11, 2013

1. ## calculus

Consider the given function and the given interval. f(x) = 4 sin x − 2 sin 2x, [0, π] (a) Find the average value fave of f on the given interval. fave = (b) Find c such that fave = f(c). (Round your answers to three decimal places.) c = (smaller value)

2. ## Physics

The maximum current in an AC circuit is 3.0 Amperes. What is the rms value of the current in the AC circuit? ...Thanks!

If 10-kg of ice at 0 degrees Celsius is added to 2-kg of steam at 100 degrees Celsius, the temperature of the resulting mixture is? Use Joules. ANSWER: 40 Specific Heats: Ice = 2060 Steam = 2020 Latent Heats: Water melting = 3.33x10^5 Water boiling =

4. ## Physics

Which of the following statements about emission spectra is correct? All the lines are evenly spaced. All noble gases have the same spectra. Each line corresponds to a series of wavelengths. All the lines result from discrete energy differences

5. ## physics

charge A has a charge of 2C, Charge B has a charge of -3C and is located 1 meter to the right of A. Charge C is located 1 meter to the right of charge B and has a charge of -1C. if a fourth charge (charge D) is placed 4 meters to the right of charge B, how

6. ## geometry

In the English alphabet, there are 7 capital letters that look the same after being rotated 180∘. Those letters are H, I, N, O, S, X, and Z. How many different 3 letter "words" can be made from these letters such that when the word is rotated 180∘, the

7. ## mathematics

a boat sails 150km on a bearing of 42 degree and then 250km due east.how far is the boat from the starting point.

8. ## Soc. Studies

How did President Jackson respond to the Supreme Court's ruling in Worcester v. Georgia that Georgia had no right to interfere with the Cherokee? A. He asked Congress to revoke the Indian Removal Act of 1830. B. He appealed the decision on the grounds that

9. ## Chemistry

Naphthalene combustion can be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is -40.1 kJ/g. When 0.8210 g of naphthalene was burned in a calorimeter containing 1,000. g of water, a temperature rise of

10. ## Statistics- HELP!

2. The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually. Rathburn's director of marketing wants to determine

11. ## math

adam read a 360 page book in 3 days. he read twice as many pages on the middle day as he did on the first day or the last day. how many pages did he read on the last day.

12. ## Science!

How many grams of NH3 gas can be made if 42.0 g of N2 gas and 12.0 g of H2 gas react with each other? N2 + 3 H2 ↔ 2 NH3

13. ## math

Write 0.026 As a sum using powers of 10 to show place value

14. ## Physics

A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 "'s." What distance is traveled if the person is brought to rest at this rate from 115 ?

15. ## physics

The wavelength of the electromagnetic waves is 200 nm. Which of following regions does it belong to? visible light region ultra violet light infrared region x-ray region

16. ## World history; Check:P

What is the significance of the twelve tablets The Twelve TABLES were significant because they were an early example of written law displayed publicly for all who could read them, another example being Hammurabi's Code What measures did the government take

17. ## Pre cal

From a point A is 8.20 meters above level ground,the angle of elevation of the top of a building is 31degrees 20 min and the angle of depression of the base of the building is 12degree 50 min. Approximate the heighth of the building

18. ## Analytic Geometry

Find the equation of the parabola through (-15/4 ,2) and (0,-1) whose axis is parallel to the x-axis and the latus rectum equal to 4

19. ## - English

The Arctic region, where winters are long and cold, is home to more than 400 species of flowering plants. Which group of words is an adjective clause in the sentence? of flowering plants where winters are long and cold is home to more than 400 species of

20. ## Math (Pre-Cal)

The infinite series S = 1/5 + 3/5^3 + 5/5^5 + 7/5^7 + 9/5^9 + ... converges. Find S.

21. ## physics

A basketball player can leap upward 0.69 m. What is his initial velocity at the start of the leap?

22. ## math

2/3 x 5/6 x 14 =

23. ## englis

One of the most commonly known_____________ which also happens to be a top favorite of mine is____________. do i need a comma's in this sentence?

24. ## physics

If a 0.5kg toy car is rolling down a hill with a velocity of 0.8m.s, what is the car's momentum?

25. ## english

What is the adjective in the sentence "The red truck was parked behind the garage"? A. red B. truck C. behind D. parked

26. ## Physics

Two blocks of lead, one twice as heavy as the other, are both at 50 degrees Celsius. The ratio of internal energy of the heavier block to that of the lighter block is? A)1:2 B)2:1 C)1:1 D)4:1

27. ## Calculus

Find the sum of the convergent series. Sigma (lower n = 0; upper infinity) 8*(4/5)^n

28. ## math

1/4x + 13 > .25(2x-32)

29. ## World history; Check:P

What contributions did Solon and Cleisthenes make to the development of Athenian democracy?Solon let all Athenian citizens participate in the Assembly and Cleisthenes created the Council of Five Hundred. What steps did Pericles take to strengthen democracy

30. ## trig

As a hot-air balloon rises vertically, its angle of elevation from a point P on level ground d = 140 kilometers from the point Q directly underneath the balloon changes from 15°10' to 29°30' (see the figure). Approximately how far does the balloon rise

31. ## math

what is 3z-5+2z=25-5z

32. ## Applied Calculus

Find the derivative of the function f by using the rules of differentiation. f(x)=340

33. ## math

what is 9/5x20)+32

34. ## math

jewelry marked 14 karat gold is 14/24 pure gold. what is the percent

35. ## math

A certain sweepstakes ticket has four categories of prizes with the following probabilities of being won: Prize Probability \$100,000 1/500,000 \$50,000 1/250,000 \$20,000 1/200,000 \$10,000 1/100,000 If each ticket costs \$1.00, what is the expected gain or

36. ## Physics

A freight train has a mass of 1.2 107 kg. If the locomotive can exert a constant pull of 8.4 105 N, how long does it take to increase the speed of the train from rest to 88 km/h?

37. ## Chemistry

CHemical equation showing how NH3 behaves as a base when dissolved in water

38. ## calculus

Find the Derivative y=(t^2+3)e^t

39. ## Abnormal Psychology

Who was the founder of the Psychoanalytic paradigm? Freud or Kraepelin?

40. ## maths

from a point R,300M north of P, a man walks eastwards to a place Q which is 600m from P. find the bearing of P from Q correct to the nearest degree

41. ## MATH

Where are the functions f1(x)=|sin(x)| and f2(x) = sin(|x|) differentiable? Use n as an arbitrary integer constant.) f1(x) = |sin(x)| is differentiable for all x ≠______________ f2(x) = sin(|x|) is differentiable for all x ≠______________ No one has

42. ## English

Hello. I'll be very grateful for some help again. Do you think it's OK to use "resolve" in the present perfect continuous tense, for example: "they have been resolving the problem for several weeks"? Thank you very much for all your answers.

43. ## Math

The diameter is 9.3 meters what is the circumference and area?

44. ## chemistry

what volume of a concentrated HCl solution which is 36% HCl by mass and has a density of 1.179g/ml should be used to make 5.30L of an HCl solution with a pH of 1.8?

45. ## Analytic Geometry

A parabola has a directrix y=-3, axis =4 and latus rectum equal to 2. find its equation. Please help me its for my homework

46. ## math

If x = 15 units, y = 7 units, and h = 4 units, then what is the area of the trapezoid

47. ## Physics

A conductor of length 2m carrying a 1.5A current experiences a force of 2.2 N. What is the magnitude of the magnetic field that acts perpendicular to the flow of current in the conductor?

48. ## World history; Check:P

I can't seem to understand what this question is asking, but I have tried to answer it. Can someone check it please? :) Why were the epics of importance to the Greeks of the Dorian period? Answer: The Dorians were far less advanced than the Mycenaeans. The

49. ## math

the two-way table shows the number of students that do or do not do chores at home and whether they receive an allowance or not. find and interpret the relative frequencies of students in the survey by columns. allowance no allowance total chores-

50. ## STATISTICS

ASSUME THE THE MEAN WEIGHT OF CHILDREN AGES 7 IS 50 POUNDS AND A STANDARD DEVIATION OF 10. wHAT IS THE PROBABLITY THAT A RANDOM SELECTED 7 YEAR OLD WILL HAVE A WEIGHT THAT IS LESS THAT 65

51. ## physics

A swimmer is capable of swimming at 1.4m/s in still water. Calculate the following. i. How far downstream will he land if he swims directly across 180m wide river? ii. How long will it take him to the other side.

52. ## math

Brent has #3.35 in quarters and dimes. He has 23 coins in all. How many quarters and dimes does he have? Write a system of equations to solve

53. ## Math rem

2.Find the length of the arc in a circle if the radius of the circle is 24cm and the degree of the arc is 90o 3.Find the length of the arc if a circle if the degree if the arc is 120o and the length of the radius is 8cm. 4. A circle has a radius of 7. Find

54. ## College Physics 2

A parallel-plate air capacitor is made from two plates 0.250 m square, spaced 0.70 cm apart. It is connected to a 140 V battery. a) What is the capacitance? C = 7.90×10−11 F b) What is the charge on each plate? Enter your answer as an absolute value of

55. ## maths

What is the value of 321 rounded up to the nearest 10?

56. ## Calculus

Determine whether the sequence with the given nth term is monotonic. Find the boundedness of the sequence. Otherwise, indicate DNE. An = ne^(-n/2)

57. ## World History- (Ms. Sue).

Prejudice is significant because it was what immigrants had to face due to the native-born Americans' fears?

58. ## science

1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago from a cloud of gas and dust less than a million years ago from a chunk of Jupiter 2. Two of the inner planets are ____. (1 point) Venus and Saturn Mars and Venus

59. ## physiiics

Which of the following is correct for the two coherent light waves to produce zero light? The light waves should travel in perpendicular directions. The light waves are in phase with each other The light waves are out of phase with each other. The light

60. ## Physics

A feather is dropped onto the surface of the moon. How far will the feather have fallen if it reaches the surface in 9.00 seconds? Given: g on moon = -1.63 meters/second2

61. ## math

Sally spent \$36 and had \$12 left. What percent of her money did she spent?

62. ## bramalea secondary school

how many ways can you roll a pair of standard dice without getting a double?

63. ## maths

A coin is tossed M+N times,M>N,then the chance of getting at least consecutive head is

64. ## maths-urgently needed

If in a triangle ABC, c(a+b) Cos B/2 =b(c+a) Cos C/2 then the triangle is :- 1. isosceles 2. Right angled 3. isosceles or right angled 4. none of these I want the explanation

65. ## math

what is expression 5 factorial equal

enzo and eric are a sharing a pie. if enzo eats 1/3 of the pie and eric eats 1/5 of the pie, is there more than 1/2 of the pie remaining.

67. ## Math

If 15 baseballs weigh 75 ounces, how many baseballs weigh 15 ounces?

68. ## math

I need help solving this problem -x-7x=

69. ## Chemistry

What is sigma framework?

70. ## Math

Write a number sentence. Marshall sleeps 8 hours each day. How many hours does Marshall sleep in one week? How many hours is Marshall awake each day

71. ## org. chem

The question asks, "draw the hemiacetal obtained by addition of ethanol 2-methylpentanal" My question is how to do this problem? I know you can't actually draw it out on this site. However so I know how to do it on the upcoming test. Thanks :)

72. ## math

Each of two observers 475 feet apart measures the angle of elevation to the top of a tree that sits on the straight line between them. These angles are 55° and 59°, for observers A and B, respectively. How tall is the tree? How far is the base of its

73. ## Calculus

Find the derivatives of the function k(x)=sqrt(sin(2x))^3 I think I have the answer and was wondering if i had it correct k'(x)=2sin(x)^3+8sin(x)

74. ## Math

two sides of a triangle have the ratio of 3:4. The hypotenuse is 20. What are the measures of the two other sides?

75. ## chemistry

A 0.10-mol sample of H2(g) and a 0.10-mol sample of Br2(g) are placed in a 2.0-L container. The reaction H2(g) + Br2(g) 2 HBr(g) is then allowed to come to equilibrium. A 0.20 mol sample of HBr is placed into a second 2.0-L sealed container at the same

76. ## PHYSICS 2 !!!

At its normal operating speed, an electric fan motor draws only 10.9% of the current it draws when it just begins to turn the fan blade. The fan is plugged into a 120.0-V socket. What back emf does the motor generate at its normal operating speed?

77. ## Math

Number Sense Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not. Tennis--2 players Basketball--5 players Softball--10 players

78. ## physics

what frequency and period would be required for sally and her hard-working partner to produce a standing wave with three nodes?

79. ## math

A certain sweepstakes ticket has four categories of prizes with the following probabilities of being won: Prize Probability \$100,000 1/500,000 \$50,000 1/250,000 \$20,000 1/200,000 \$10,000 1/100,000 What is the expected value of buying these sweepstakes

80. ## MATH

A camping store put in an order for flashlights and sleeping bags. The number of flashlights ordered was 3 times the number of sleeping bags. The flashlights cost \$12.00 each, and the sleeping bags cost \$45.00 each. If the total cost for the flashlights

81. ## engineering

Anybody knows the quiz3 of coursera "control of mobile robots"?

82. ## physics

Imagine a spring floating in space. This spring has a very small length when it is unstretched. The spring constant for this spring is 4.2 N/m. Now place 2.6 μC charges on each end of the spring, and allow it to stretch until it reaches a new equilibrium.

83. ## math

sarah has a bag of mixed lollies.T?he bag contains toffees,mints,fruit drops,smarties,jelly beans,candies and licorice.She allows everyone in her class to choose 3 lollies,but they must not choose more than one of each kind.How many different combinations

84. ## math

jewelry marked 14 karat gold is 14/25 pure gold. what is the percent

85. ## Math Word Problem

Tristen mixes nuts that cost \$2.00 per pond with nuts that cost \$4.00 per pound. He buys triple as much of the \$2.00 per pound nut than he buys of the \$4.00 per pound nut. If he spent a total of \$32.00, how many pounds of the \$2.00 per pound nut did he

86. ## Math

Write a number sentence. Marshall sleeps 8 hours each day. How many hours does Marshall sleep in one week? How many hours is Marshall awake each day?

87. ## English

Hello. Please help me with a few questions. 1)Do you think it's possible to use "as expected" in reference to the future, for example: "As expected, they will arrive next week"? 2)Do you think the word combination "to gain a historic triumph over someone"

88. ## math

Andrea buys four shirts and three pairs of pants for \$85.50. She returns the next day and buys three shirts and five pairs of pants for \$115.00. What is the price of each shirt and each pair of pants? How would I solve this? I need to show my work...

89. ## english

What does Mrs. Frank think of the idea of Peter being Anne’s boyfriend? She is thrilled that Anne will finally have a boyfriend. She doesn’t really care if Anne has a boyfriend. She is uncomfortable with idea that Anne might have a boyfriend.

90. ## math

Flag question Question text A fair coin is tossed 6 times. What is the probability to the nearest hundredth of obtaining at least one head? Select one: a. .08 b. .98 c. .50 d. .02

91. ## organic chem

Draw the hemiketal obtained by addition of methanol to 3-methyl-2-hexanone This is what I got: 3-methyl-2-hexanone + CH3OH CH3CH2CH(CH3)CH2C(OH)(CH3). But my answer is line angle formula because that's what the professor wants here's my line formula CH3

92. ## MATH

Posted by xavier on Monday, February 11, 2013 at 8:28pm. Hello... Asking for help with this one math question to understand how to do the rest of related question? thank you in advance.... shape 1 (3.5,-8.5) ,(3.5,-9) , (3,-10.5) , (2,-12)

93. ## org. chem

Can someone explain in simple terms the difference between hemiketal and hemiacetal? Just curious

94. ## Algebra

A function is given. Determine the average rate of change of the function between the given values of the variable. f(x) = 6 − x2; x = 2, x = 2 + h

96. ## math

Englewood averaged 17 problems right on the math decathlon. Avalon park elementary scored an average of 14 problems right. Which equation shows the difference, (d), between the average points scored by gthe englewood and avalon park? a. d=17 x 14 b.

97. ## math

study the function table below vases flowers 4 12 7 21 8 24 11 33 v f which expression could be used to find the number of flowers (f) in (v) vases? my answer is a. is that correct

98. ## maths

What is the vector equation of the line joining the points (5; 0; 1) and (7; 4; 7)?

99. ## math

Decimal numbers with digits both before and after the decimal point, such as 16.75, are referred to as: A. the quotient. B. the remainder. C. mixed decimal numbers. D. decimal point numbers.

100. ## Math

Next door neighbors Moe and Larry are using hoses from each of their houses to fill Moe's pool. They know it takes 12 hours using both hoses. They also know that Moe's hose, used alone, takes 40% less time than using Larry's hose alone. How much time is

101. ## Science

Pluto alters the orbit of which planet? Uranus Saturn Neptune * Jupiter My guess is Neptune? There is not alo of info. that said the word "alters"? Help please....

102. ## math

The perimeter of a rectangular playground is 40 yards. It is 1.5 yards longer that it is wide. What is area of playground?

103. ## 5ht grade math word problems

sue baked chocolate chip cookies. although the recipe said it would make 5 dozen, she actually made 4 less than that. if there were slightly more than 500 chips in the package what is the average number of chips for each cookie?

104. ## math

The perimeter of a rectangular playground is 40 yards. It is 1.5 yards longer that it is wide. What is area of playground?

105. ## english

In the play Antigone Which character do you think is wholly right in their actions? Wholly wrong? Partially right or wrong? Give reasons for your judgement.

106. ## calculus

Find the integral of: dx/(x^2-4x)

107. ## calculus

Find the integral of (tan x)^2 sec(x)dx

108. ## Math

4 friends share 3 melons.

109. ## Math

3 classmate share 5 sandwich

110. ## English/Lang. Arts

Many Jewish people, like Anne’s family, hid to escape Nazi persecution during World War II. In what other way did people attempt to save themselves?A.They asked the Nazi party for protection. B.They fled to North and South America. C.They signed

111. ## math

I have a piece of rope 3 1/2 ft long. I use 3/4 on a project. How much I have left?

112. ## Math Help Plaese!!!!!!

Calculate the final price you would pay to buy jacket that originally sells for \$65, but is discounted by 40%; you also have to pay 5% sales tax. Explain.

113. ## Math (Pre-Cal)

There is exactly one triangle the length of whose sides are integers in arithmetic progression and whose area is 156 square units. Find the perimeter of this triangle.

114. ## Math Word Problem Help

Your high school is having a spring carnival. Admission into the carnival is \$3 and each game inside the carnival costs \$.50. Write an inequality that represents the possible number of games that can be played having \$20. What is the maximum number of

115. ## math

A model of a boat is 1 3/8 feet long. How long is the model of a ship that is 3 times as long, I'd the models are made to the same scale?

116. ## Probability Word Problem

Julie has three choices of a lunch and 4 choices of a drink. How many different ways can she choose a lunch and a drink?

117. ## Lang. Arts Help

What do you learn from the dialogue between Mr. Frank and Miep at the beginning of Scene 1? A.Miep wants to show Mr. Frank something in the building. B.Mr. Frank wants to live in this building to hold on to his memories. C.The war has ended, but Mr. Frank

118. ## math

7/8 x 4/5 = I got 28/40 so is it 7/10

119. ## Lang. Arts

Choose the sentence that is punctuated correctly. A.I would like to eat a big breakfast, watch a movie, and lounge on the sofa this Sunday. B.I would like to eat a big breakfast, watch a movie, and lounge on the sofa, this Sunday. C.I would like, to eat a

120. ## math

In how many ways can the grand prize ticket and second prize ticket be selected from 400 tickets?

121. ## Statistics

Research design is an area where researchers collect various data to address important questions. For example, if researchers wish to find characteristics of people most likely to develop lung cancer, they will have to collect appropriate data first.

122. ## math

Brittany is making trays of fudge. her recipe calls for 2/3 cup of walnuts for each batch of fudge. How many cups of walnuts does she need to make 27 batches of fudge I need to show how I got this answer

123. ## math

What is the compound amount and compound interest of \$15,000 invested at 6% compounded quarterly for 27 months?

124. ## org. chem

Draw the acetal obtanined from 1-propanol and benzaldehyde Draw the ketal obtained from 2-propanol and 3-methylcyclpentanone Can someone tell me where the actal/ketal comes from or do I just add it to the equation. Not sure how to start this. Thanks :)

125. ## gr12 math

how do you know which face is the base of a triangular prism?

126. ## Math

How could I find the volume of a bowling pin using geometry and or calculus?

Natalie picked 135 berries in 15 minutes. If she continues picking at that rate, how long will it take her to pick 486 berries? Explain.

128. ## Statistics

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the

129. ## Statistics

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the

130. ## physics

list and explain 5 locking devices

131. ## geometry

Missy and Mussy are very messy sisters. Their dresser drawer consists of 43 white socks, 2 black socks, 23 blue socks and 8 red socks. What is the minimum number of socks they must remove from the drawer to be certain they have four socks of the same

132. ## geometry

Missy and Mussy are very messy sisters. Their dresser drawer consists of 43 white socks, 2 black socks, 23 blue socks and 8 red socks. What is the minimum number of socks they must remove from the drawer to be certain they have four socks of the same

133. ## geometry

Three circles, each with a radius of 10, are mutually tangent to each other. The area enclosed by the three circles can be written as ab√−cπ, where a, b and c are positive integers, and b is not divisible by a square of a prime. What is the value of

134. ## Math

1/3 of 6= 2/5 of 10= 5/5 of 5=

135. ## math

the volume of a triangular prism is 226.08 cubic inches. if the area of the base is 28.26 square inches, what is the height of the triangular prism?

136. ## geometry

A semicircle has AB as the endpoints of its diameter, and AB=80. Points C and D are on the circumference of the semicircle such that AD=BC=40. What is the length of DC?

137. ## geometry

ABCD is a rectangle. On line segment AB, E is a point such that ∠ADE=17∘ and ∠BCE=29∘. What is the measure of ∠DEC (in degrees)?

138. ## Math

Beatriz has 8 turtles.two fourths of them are. Box turtles.how many of the turtles are box turtle?

139. ## trigonometry

It is given that sin(θ)=15√. In addition, a and b are coprime positive integers such that cos(2θ)=ab. What is the value of a+b?

140. ## chemistry

a student dissolves 80 mg of a crude product in 4.5 mL( the minimum required) of methanol at 25 deg C . She cools the solution in an ice bath and obtains crystals. The crystals are recovered by filtration and rinsed with 0.5 mL of ice-cold methanol. After

141. ## algebra

The variables x and y satisfy the equations 2/x−24/y=−1 and 6/x+33/y=2. Find the product xy.

142. ## math

Ms. shoemaker has 35 students in her classroom. Of those students 6/7 are right handed and 4/5 of te right handed students have brown eyes. How many right handed brown eyed students are in the class.

143. ## Statistics

Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a. What is the probability that exactly 2 of the 4 correctly identify the

144. ## Net ionic reaction

What is the net ionic equation of MgS04 with Sr(N03)2? I get most of the equation right but i think im missing something...

145. ## Math

Josh has a job walking dog.he walks a total of 18 dogs each week. Today,he is walking one third of the dogs.how many dogs is josh walking today?

146. ## Pre Algebra

I have to design new dice for a board game. I have to use two standard cubes each with six faces and number then in such a way the the probability of rolling the numbers 1-12 are the same

147. ## maths

Two trains A and B 50kms apartare approaching each ather at 30km/hr and 20km/hr respectively. A bee travelling at 80km/hr hovers between d two trains. How many km will d bee cover before d two trains collide

Pam and Tim decide to start saving money for their daughter's college education. They open a college savings plan (529) with a 500 dollars initial investment and next month start to make monthly deposits of 120 dollars. If the account pays 8% compounded

149. ## math

describe a model that represents 3/3 x 4/4 I need to explain this

151. ## Chemistry

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 235 torr. Pure pentane and hexane have vapor pressures of 425 torr and 151 torr, respectively, at room temperature. What is the mole fraction

152. ## math

how would you figure this problem how much fencing to the nearest foot is neeeded to enclose an area of 350ft2

153. ## math

shape 1 (3.5,-8.5) ,(3.5,-9) , (3,-10.5) , (2,-12)

154. ## Lang. Arts

Based on what you have read so far, what is the one thing that always changes when a scene changes in The Diary of Anne Frank? A.the Franks’ reason for hiding B.the passage of time C.the use of voiceover for Anne’s diary I think it is B...? Thanks

155. ## chemistry

help please, have no clue how to solve this. (a) you are given a mixture containing two compounds, A and B. both compounds have a solubility of 1g/100mL of solvent at 20 deg C and 16g/100mL of solvent at 100 deg C. The sample is composed of 3.5 g of A and

156. ## Math

Where are the functions f1(x)=|sin(x)| and f2(x) = sin(|x|) differentiable? Use n as an arbitrary integer constant.) f1(x) = |sin(x)| is differentiable for all x ≠______________ f2(x) = sin(|x|) is differentiable for all x ≠______________

157. ## Lang. Arts

Which sentence is punctuated correctly? A.Greg’s family adopted a young active puppy. B.Lisa filmed two, dramatic movies this year. C.Meg heard there is an unusual, exciting show tonight. I think it is A or C...leaning towards A?

158. ## chemistry

a container holds 200 pounds of water or 132 pounds of gasoline. what is the density of gasoline in g/mL? (hint; the density of water was calculated in the early experiment to be 0.962g/mL)

159. ## Lang. Arts

Which sentence is punctuated correctly? A.Greg’s family adopted a young active puppy. B.Lisa filmed two, dramatic movies this year. C.Meg heard there is an unusual, exciting show tonight. I think it is A or C...leaning towards A?

160. ## Chemistry

CONCENTRATION OF NaClO IN COMMERCIAL BLEACH. Bleach comes as 6%(mass/volume) solution of NaClO. Calculate the Molarity of NaClO in bleach to three significant figures ( you need molar mass of NaClO)

161. ## geometry

A rectangle has length and width in the ratio of 5:9. If the perimeter is 280, what is the length of the rectangle?

162. ## Finance

You (or your parents) plan to pay \$1,275.00/month for a mortgage. How much is the minimum realized income per month to the nearest penny

163. ## Science

which of the following is a function of DNA 1)controlling the production of proteins in the cell 2)breaking down proteins in the cell 3)producing energy from food molecules inside the cell 4)controlling substances that enter and leave the cell 5)joining

164. ## college chemistry

How will the Rf values be affected if i use a highly polar mobile phase instead of one that has intermediate polarity?

165. ## science

a poem on cell division

166. ## maths-urgently needed

If in a triangle ABC, c(a+b) Cos B/2 =b(c+a) Cos C/2 then the triangle is :- 1. isosceles 2. Right angled 3. isosceles or right angled 4. none of these I want the explanation

167. ## Maths Percentage

After spending 30% of his money, John had \$140 left. How much did he have at first. Siti and Ali saved \$4500. Ali and Jim saved \$2950. Siti saved thrice as much as Jim. How much did Ali save? At a concert, there were 15 more children than adults. Each

168. ## Anonymous

A motorboat whose speed in still water is 2.86 m/s must aim upstream at an angle of 25.4 degrees (with respect to a line perpendicular to the shore) in order to travel directly across the stream.What is the resultant speed of the boat with respect to the

169. ## science

a planet has a radius of 5950 km and a value of g at the surface of 8 m/s2. If the planet decides to put a satellite into citcular orbit, what horizontal (orbital) speed must the satellite achieve?

170. ## Chemistry

Someone said, "Calculate the total delta H of the reaction and subtract the total delta H of the product from it. If you get a positive value, it radiates heat which means it's exothermic. If it is negative, heat is needed to get a reaction so it is

171. ## Physics

Situation: While holding his rifle at shoulder-level, a 1.8 meter tall hunter accidentally discharges it straight up into the air. Questions: 1) If the bullet exits the barrel of the rifel at 200 meters per second squared, how many seconds does the hunter

172. ## math

d equals 4 and 5 eighths inches where 1 half inch equals 355 miles

173. ## Math

Find the values of the six trigonometric functions for ∠A in standard position determined by the point (63, 280). Enter your answers as fractions.

174. ## Math

Josh borrows some money on which he makes monthly payments of \$125.43 for 3 years. If the interest rate is 5.4%/a compounded monthly, what will be the total amount of all of the payments at the end of the 3 years?

175. ## social studies

after the treaty of paris how long were the Spanish in charge of FL

176. ## Math112

Perform the indicated operation (8t^2-4+2)-(5t^2-5t+7)

177. ## math

Anny is having a party .The first guest arrived by himself.3 guests then arrive together,each successive group arrives with 2 more guests than the group that entered previously.How many guests will have arrived when the twentieth group enters the room ?

178. ## math

what kind of book can help me understand about propabilities,please let me know,i am not lazy,but i am really not understand,many thanks

179. ## Math

A person jumps off a 20m high cliff into the water below. The height of the person above the ground at t time seconds is given by the equation h=-5t^2+30. How long does it take the person to reach the half way mark to the water?

180. ## standard deviation

If Professor Wilson found that the test scores of his students had a variance of 4.4, what is the standard deviation? Type a numerical answer in the space provided. Round your answer to the nearest tenth and do not type spaces in your answer.

181. ## social studies

what are the main functions of chief minister

182. ## Gen Chem II

Thanks for the information Dr. Bob. Would you be able to work it out so that I can actually see the steps with the numbers and follow from there. The question was on Vitamin K from Sunday at 2:44pm which you answered at 3:45pm. Thanks again. I am looking

183. ## maths

Q:20 A clock was 4 minutes slow at noon on Friday and 4 minutes 36 seconds fast on the following Friday at 4 P.M. If the clock gains uniformly, when does it show the correct time? A:8 P.M. on Monday (after second Friday) B:8 P.M. on Monday (between two

184. ## Physics

A lamp hangs vertically from a cord in a descending elevator with a constant deceleration a. If the tension in the cord is T0, answer the following. (Use any variable or symbol stated above along with the following as necessary: g.) (a) What is the lamp's

185. ## CIS logic and design

pseudocode that requests and receives student names and an exam score for each

186. ## Physical Science Help!

Can someone please help me balance these equations? Thank you for your time!! 1. NO + O2 ¨ NO2 2. NH4Cl + Ca(OH)2 ¨ CaCl2 + NH3 + H2O

The area of a certain rectangle is 288yd^2.the perimeter is 68yd.if you double the lengths and widths,what will be the new area and perimeter of the new rectangle be?

188. ## intro to physical science

what is the Celsius equival of a temperature of 160 F

189. ## Math

A 7 4/5 ounce can of cat food costs 38 cents. What is the unit rate (price per ounce) of the cat food?

190. ## Finance

A rich man has 1 million dollars in the bank earning 7% interest. He plans to give away \$100,000 at the end of the year and to increase his gifting by 10% per year thereafter. How long will the million dollars last?

191. ## Lang. Arts

Which of the sentences below is punctuated correctly? A. I opened the door and my cat ran outside. B. I opened the door, and my cat ran outside. C.I opened the door, my cat ran outside I think it is A?

192. ## intro to physical science

the specific heat of granite is 0.80 KJ/kg . c. I f 1.6 MJ of heat are added to a 100-kg granite statue of James Precott Joule that is originally at 18 C, what is the finale temperature of the statue

193. ## Lang. Arts

We hung makeshift curtains in our room using? A.bed sheets. B.old curtains. C.new curtains I think it is A?

194. ## Biochemistry

1. Given the following equation: Glycerol-3-phosphate glycerol + Pi Go’ = -9.7 kJ/mol At equilibrium the concentrations of both glycerol and inorganic phosphate are 1 mM. Under these conditions, calculate the final concentration of glycerol-3-phosphate.

195. ## Math

Maria bought 5 cans of tennis balls. Each can contained 3 tennis balls. How many tennis balls did Maria buy altogether?

196. ## math

(1)Robert is thinking of two numbers. Their greatest common factor is 6. Their least common multiple is 36. One of the numbers is 12. What is the other number Answer: 18 please help Ms.Sue I think the answer is right not sure how I got it please explain or

197. ## Calculus

A deposit of \$1000 is made at the beginning of each month in an account at an annual interest rate of 3% compounded monthly. The balance in the account after n months is An = 1,000(401)(1.0025^n - 1). (a) Compute the first six terms of the sequence {An}.

198. ## algebra

Sort these numbers describe your sort rule 5, 10, 16, 19, 24, 37, 40

199. ## algebra!

x is a number such that x2+3x+9=0. What is the value of x3?

200. ## Calculus

Determine the convergence or divergence of the series. Find the limit. Indicate the test that was used and justify your answer by showing evidence why the test succeeds or fails. Sigma (lower index n = 1; upper index infinity) 12/[n(n+3)]

201. ## Math

In Ms.Ramirez's class, there are 28 students. They sit in 4 rows. How many students are in each row?

202. ## Calculus

Determine the following about the series. Indicate the test that was used and justify your answer. Sigma (lower index n = 1; upper index infinity) [sin((2n-1)pi/2)]/n A. The series diverges B. The series converges conditionally. C. The series converges

Last week, Laurie Golson packaged 289 boxes Holiday Cheese Assortment. Find her gross weekly earnings if she is paid at the following differential piece rate. Boxes packaged Pay per package per week 1-100 \$1.88 101-300 \$2.08 301 and over \$2.18 I don't know

204. ## geometry

Let O be the center of the circle Γ, and P be a point outside of circle Γ. PA is tangential to Γ at A, and PO intersects Γ at D. If PD=14 and PA=42, what is the radius of Γ.

205. ## Calculus

Test for convergence or divergence. Indicate the test that was used and justify your answer. Sigma (lower index n = 4; upper index infinity) 1/(3n^2-2n-15)

206. ## pre calc

How long would it take from 3000 to get to 8000 at 8% interest at compounded quarterly?

207. ## Calculus

Use the Direct Comparison Test to determine the convergence or divergence of the series. Justify your answer and show all of your work. Sigma (lower index n = 1; upper index infinity) 4^n/(3^n-1)

208. ## physics

A string has a linear density of 8.1 x 10-3 kg/m and is under a tension of 200 N. The string is 2.9 m long, is fixed at both ends, and is vibrating in the standing wave pattern shown in the drawing. Determine the (a) speed, (b) wavelength, and (c)

209. ## Calculus

Test for convergence or divergence. Indicate the test that was used and justify your answer. Sigma (lower index n = 2; upper index infinity) [ln(n)]/n

210. ## arithmetic

A group of friends are planning a road trip. If they all contributed \$24, then they would be \$6 short of the total. If they all contributed \$25, then they would have \$3 more than needed. What is the total cost of the trip?

211. ## Physics

A thin 5.4-m metal rod sustanins a longitudinal standing wave with vibration antinodes at each end of the rod. There are no other antinodes. The density and Young's modulus of this metal are, respectively, 5200 kg/m^3 and 7.9x10^10 N/m2. What is the

212. ## Calculus

Determine the convergence or divergence of the series. Indicate the test that was used and justify your answer. Sigma (lower index n = 1; upper index infinity) [(-1)^n*3^n]/(n*2^n)

213. ## Math

how to solve polynomiels?

214. ## nothing

can anyboby help me with that last question i posted pleaseeeee i really need help!!!

215. ## Chemistry

Consider 54.0 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 4.200. What volume of water must be added to make the pH = 5.500? I found HA for both and then I used C1V1 = C2V2 plugging in the concentrations of HA in C1 and C2 and 0.054

216. ## math

If x=12 and y=14 .Find the value of (x+y)^x/y ????

217. ## Calculus

The population of bacteria in one cubic centimeter of the blood of a sick person has been modeled by the function P(t) = 80t(0.86^t) where t is the time, in days, since the person became ill. I was able to answer all of the questions besides, Estimate how

218. ## Calculus

Find the values of x for which the series converges. Sigma (lower index n = 0; upper index infinity) [(x+1)/4]^n

How does managers benefit from developing three different budget estimates for the same time period?

Hi i'm trying to write a lead for my Journalism class, tell me which works best. If they both need revised can you point it out? In Kalamazoo County unemployment for white people is at 10.2 percent, whereas for black people it is at 21.2 percent, according

221. ## Calculus

Identify the two series that are the same. a. Sigma (lower n = 4; upper infinity) n(3/4)^n b. Sigma (lower n = 0; upper infinity) (n+1)(3/4)^n c. Sigma (lower n = 1; upper infinity) n(3/4)^(n-1)

222. ## physics!!!!!

When the distance between the hole and floor is h1=20 cm, the images's length is l1=20 cm; when the distance between the hole and floor is h2=40 cm, the images's length is l2=36 cm . What is the length L of the ceiling lamp in m?

223. ## Physics Help

Charge is distributed uniformly along the x axis with density ßx and uniformly along the y axis with density ßy. Calculate the electric field at the points (a) r = a i + b j, and (b) r = c k.

224. ## physics

A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of strength and jumping due to the lower Martian gravity. The surface gravity of Mars is 0.38 times that of earth. If John could

225. ## Physics Help

Charge Q is uniformly distributed around the perimeter of a semicircle of radius R. What is the electric field at the circle's center?

226. ## Math

Please someone help with my pre calc question!

227. ## math

a ribbon is 45 cm long is cut into 2 pieces one piece is 4 times longer then the other find the length in cm of both ribbons

228. ## physics

The waterfall "Angel Falls" in Venezuela is the world's tallest at h=979 m. Assume that the water's velocity on the top of the falls and on the bottom of the falls (after it hits the ground and begins to flow away) is equal, and that no total energy is

229. ## Physics Help

An electron with velocity v = 2.4 × 106 m/s i encounters an electric field E = 1250 N/C i. How long will it take for the speed to be one fourth its original value?

230. ## calculus

Find the derivatives of the functions k(x)=(x^3+e^x)^4

231. ## Calculus

What is the graph of the sequence An = (-1)^n?

232. ## Accounting

What affect can the incorrect (intentional or unintentional) posting, journalizing, and reporting of financial data have on a company, an accountant, or a company's stakeholders?

233. ## maths-urgently needed

If in a triangle ABC, c(a+b) Cos B/2 =b(c+a) Cos C/2 then the triangle is :- 1. isosceles 2. Right angled 3. isosceles or right angled 4. none of these I want the explanation

234. ## Calculus

Approximate the sum Sigma (lower n = 0; upper infinity) (17/3)*(-1/2)^n

235. ## Biochemistry

The Go’ value for the hydrolysis of glucose-6-phosphate is -13.8 kJ/mol. Assuming a concentration of 4 mM for this molecule, what would the phosphate concentration be at equilibrium (G = 0). Remember to convert kJ to J.

236. ## english

More than a thousand people are killed in road accidents during the december hoildaeys how can this carnage on our road be stopped?

how does the term balance sheet reflects the organization of information in the financial statements?

238. ## maths!!!!!!!!!

If a and b are coprime positive integers such that 1/2+1/3+1/4+1/5=ab, what is the value of a+b?

239. ## Math

Because of an anticipated rainstorm, the water level in a reservoir must be lowered by 1 foot. Opening spillway A lowers the level by this amount in 4 hours, whereas Opening spillway B does the job in 6 hours. How long will it take to lower the water level

240. ## maths

how to calculate 36^6/7 ???

241. ## quick chem

Which of the following wavelengths of light has the highest energy? 1. 10 mm 2. 650 nm 3. 10 µm 4. 0.1 nm 5. 10 cm

242. ## chemistry

what is the specific heat of copper if the temperature of a 100g sample of copper is increased by 23C when 886J of heat is added ?

243. ## Math

What are the steps to solve for n?: 50000 = 1000(1 + 0.8)^n

244. ## Chemistry

When you have 250. mL of a 2.80 M solution of HCl, how many moles of HCl do you have

245. ## Chem help

Radiowaves travel at the speed of light, which is 3 X 10^8 m/s. If a certain radio station broadcasts at a frequency of 1191 kHz, what is the wavelength of these waves? in meters? C=lamda V lamda= v/c so 1191/3e8 but it doesnt work..?

246. ## chem

Given the following wavelength of light, calculate the energy of one photon in Joules. λ = 1 x 10^0 meters what does it mean? i don't know what to do or how to solve

247. ## life orientation

what according to the basic condition of employment Act applies with regard to the contravetion tha i identified?

248. ## Math

A community center has 3 tennis teams and 5 basketball teams. No one is on both teams. How many athletes are there? Tennis---2 players Basketball---5 players Softball---10 players

249. ## World History- (Ms. Sue).

What is the significance of emigrants?

250. ## Pre-Calculus

Sue is building a triangle out of sticks. The length of the first side is "a" and the second side is of length "b". The length of the third side must be between 8 and 26 units. Find the product of "a" and "b".

251. ## World History- (Ms. Sue).

Famine is significant because it forced several immigrants to emigrant to America and flee their homelands?

252. ## physics

Can someone please explain to me why or how this statement is true? I don't understand it.. Two events that are simultaneous in one inertial frame of reference will not necessarily be simultaneous in any other inertial frame of reference. Thank you

253. ## World History- (Ms. Sue).

What is the significance of immigrants?

254. ## Math

Next door neighbors Moe and Larry are using hoses from each of their houses to fill Moe's pool. They know it takes 12 hours using both hoses. They also know that Moe's hose, used alone, takes 40% less time than using Larry's hose alone. How much time is

255. ## Chemistry

Determine the boiling point(bp)of 0.44 m Naphthalene, C10H8, in Benzene, C6H6. kb(C6H6)=2.53, bp(C6H6)=80.1

256. ## World History- (Ms. Sue).

What is the significance of steerage?

If i invested 10,000.00 in a bank CD that pays a 6% annual interest. How much will the CD be worth at the end of five years

258. ## Math

Number Sense Fabio said that there are 3 times as many people on a basketball team as on a tennis team. Is he correct? Explain why or why not. Tennis--2 players Basketball--5 players Softball--10 players

Kate Eden received a graduation present of \$5,000 that she is planning on investing in a mutual fund that earns 6.00 percent each year. How much money can she collect in three years

260. ## math

I need help with 40% equal x/30 what is x.

261. ## math

If the digits of a number may be any one of 0 through 9 (except the first digit cannot be zero), and the system of alternating signs of coefficients is used to create a polynomial, what is the least number m of real zeros the polynomial can have? What is

262. ## World History- (Ms. Sue).

What is the significance of the push-pull factor?

263. ## Applied Calculus

Find the derivative of the function: f(x)=(x^2+9)/square roote of x

264. ## accounting

Suppose that two years after the bonds were issued, the required interest rate fell to 7 percent. What would be the bonds’ value?

265. ## World History- (Ms. Sue).

What is the significance of famine?

266. ## math

can someone please explain to me what happens to the mean and standard deviation of the distribution of sample means as the size of the sample decreases?

267. ## World History- (Ms. Sue).

What is the significance of prejudice?

268. ## math

A water system of 2 in.(inside diameter) pipe, having a length of 1/4 mile, is to be flushed with a volume of water equal to twice that contained in the system. how much water (gallons) must be flushed through the system? (note: one cubic foot=7.481gal.)

269. ## World History- (Ms. Sue).

What is the significance of nativists?

270. ## Geometry...

The angle of elevation of the sun at 10:00 a.m. is 29 degree. At this point, a tree shadow's is 32 feet long. How tall is the tree? IS THE ANSWER 15.5 FT?

271. ## physics

A proton and an electron enter perpendicular to the direction of the magnetic field. The speed of the proton is twice the speed of the electron. What is the ratio of the force experienced by the proton to the electron?

272. ## World History- (Ms. Sue).

What is the significance of romanticism?

273. ## World History- (Ms. Sue).

What is the significance of the Hudson River school?

274. ## clackamas

Consider a \$100 investment earning 12% compounded quarterly. How long will it take to triple your money? Round your answer to the nearest tenth of a year.

275. ## physics

A particle with a charge of -5.0 μC and a mass of 4.3 x 10-6 kg is released from rest at point A and accelerates toward point B, arriving there with a speed of 18 m/s. The only force acting on the particle is the electric force. What is the potential

276. ## English

1..He (saw, seen) dozens of beautiful yellow roses. 2. He (saw, seen) a film about safety. 3. They saw a car that (ran, run) a red light. 4. Officer Hill (did, done) a good job at our school. 1. saw 2. saw 3. ran 4. did

277. ## World History- (Ms. Sue).

What is the significance of transcendentalism?

278. ## World History- (Ms. Sue).

What is the significance of civil disobedience?

5< x-2/6

280. ## Math

Jake ate seven times more jelly beans as Sam. Together they ate 128 jelly beans. How many jelly beans did each person eat?

281. ## Chemistry

Which solution is more concentrated? a) 1.0L of 1.0M aqueous solution, or b) 1.0L of 1.0m aqueous solution

282. ## mATH

First graders who misbehave in school may be more likely to be regular smokers as young adults according to a new study presented in the July 2004 issue of the American Journal of Epidemiology. After following a group of U.S. first graders for 15 years, it

283. ## Java progamming 1

I want the program to ask for and get the price of a book from a user. The program will then multiply the price by 7% sales tax and display both the sales tax and final price of the book (price + sales tax) on the screen. using Netbeans

284. ## Physics

A car travells 20 km due north and then on a bearing of 90 degrees for 12km. Use a scale drawing.

285. ## maths

A coin is tossed M+N times,M>N,then the chance of getting at least consecutive head is

286. ## english

Which is the correct MLA citation for a magazine article? (1 point) Brian Carson. “The Real Story Behind Bigfoot.” Myths and Legends Mar. 2010: 20. Print. Carson, Brian. “The Real Story Behind Bigfoot.” Myths and Legends Mar. 2010: 20. Print. Brian

287. ## math

what is 85 nearest tenth

288. ## science helppp.

4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____. (1 point) stars meteors meteorites asteroids

9/5xC)+32

290. ## Math

A survey reported that out of 50 teenagers, 9 said they get their news from a newspaper. At this rate, how many out of 300 teenagers would you expect to get their news from a newspaper?

291. ## English/Lang. Arts

Which of the following sentences from the article is an example of hyperbole? Here are the examples... A. Ivory-billed woodpeckers still graced the planet. B.According to experts, they need large areas of old-growth forest, including many big, dead trees,

292. ## math

Peter wants to wear a 3 piece outfit .In the wardrobe he has a white shirt and a blue shirt,a pair of brown trousers,a pair of black trousers and some blue jeans.He has a cashmere coat and a windcheater.How many different 3 piece outfits can he wear? Is it

293. ## math

Suppose 8 out of every 20 students are absent from school less than five days a year. Predict how many students would be absent from school less than five days a year out of 40,000 students.

294. ## auditing

Bill Jensen, a staff member of Zhan & Co., CPAs, has given you the following list of what he refers to as “internal control deﬁciencies” for the Zabling Co. audit and has asked you to review each point and make certain that you agree that each is an

295. ## A2 Chemistry

This question is about the unnecessary production of carbon dioxide Outdoor flames, such as patio heaters and the Olympic flame, contribute to global warming. This is not only due to the heat released, but also due to the carbon dioxide produced from the

296. ## PHYSICS

At its normal operating speed, an electric fan motor draws only 10.9% of the current it draws when it just begins to turn the fan blade. The fan is plugged into a 120.0-V socket. What back emf does the motor generate at its normal operating speed?

297. ## Math

Write a number sentence. Marshall sleeps 8 hours each day. How manu hours does Marshall sleep in one week? How many hours is Marshall awake each day?

298. ## Algebra

Find the degree of each monomial -3

299. ## math

diane works at a public university and contributes \$625 per month in her retirement fund. the fund returns 3.84% a year, compounded monthly. how much will she have in her account after 15 years. b. the economy gets better and the return is 7.72%. So now

300. ## Chem Help!!!!!

The angle iron pictured here is made of steel with a density of 7.78g/cm^3. (Figure 1) measurements are: 12.78cm 10.26cm 1.35cm 2.75cm 1.35cm

301. ## math

jason has 12 coins in his pocket ,he has twice as many nickles as he has quarters how many nickles does jason have

302. ## Math

Nata spent \$28 on 2 DVDs. At this rate, how much would 5 DVDs cost?

303. ## journalism

I'm using a source, can you see if this makes sense.. It's just a piece of my report I'm writing According to Deisinger, at the last two Project Connect events, KCPRI provided services to over 1,500 participants. The racial breakdown for their November,

304. ## Chem

What mass of protons would be required to just neutralize the charge of 3.5 of electrons?

305. ## Chem

What mass of protons would be required to just neutralize the charge of 3.5 of electrons?

306. ## Math

Tricia spent \$12 to rent ice skates. She rented them for 4 hours. Which number sentence can you write to find how much it costs to rent skates for one hour?

307. ## Chemistry

C6H14 + 19/2 O2 -> 6 CO2 + 7H2O delta H = -4163 kJ What mass of hexane is required to produce 1.0E5 kJ of heat by complete combustion? -4163 kJ/mol x mol C6H14 = 1E5/-4163 kJ/mol Mol = 1E5/-4163 kJ/mol Mol = -24 mol I know I can do m=n x MM now, but

308. ## physics

A crane is used to hoist a 500kg crate vertically at a constant velocity of 4 meters per second. Ignore the effects of friction. a) calculate the magnitude of the net force experienced by the crate b) calculate the magnitude of the force applied by the

309. ## Precalc

1. Find the exact value 3sin(invertangent (-1)) I got 0. Given 0

310. ## english

A person who is meticulous is likely to make swift decisions live a very chaotic life have a very clean house