# Questions Asked onMarch 14, 2013

1. ## math 7

Mary had a bag that contains 9 green marbles, 7 red marbles, and 8 blue marbles. whats the prob that Mary will draw a green or red marble\

2. ## geochemistry

Been trying to balance this equation for a while, but can't get the right answer. any help would be apperciated! CH2O (aq) + NO3 - ---> N2 + HCO3 - + CO2(g)

3. ## Chemistry

48g of ice at its melting point is heated with steam at its condensation point. The final temperature of the system is 50 degree Celsius. How much steam was used to melt the ice? q=(48g)(1mol/18g)(50-0C)(0.97kcal/mol*C) = 129kcal Not sure where to go from

asked by Sarah L.
4. ## word problem

juan bought 12 oranges and ate 1/4 of them carla bought 12 oranges and ate 1/3 of them . which ate more

5. ## science

Describe how you would go about making 1200mL of 0.100 Molarity HNO3 from a concentrated solution that is 12 Molarity?

6. ## Math

Can in a Cone Find the volume of the largest can that can fit entirely under a cone with volume 900 cubic cm. 1.draw pictures of at least THREE different cases (including the endpoints if any). 2. define all variables CLEARLY (with words) and then use

7. ## PHYSICS

Example 2: a) A desk has a mass of 68.75 kilograms. If the coefficient of static friction between the desk and the floor is 1.1, what force must be used to move the desk from rest? b) Once the desk above is in motion, what force must be used to keep it

8. ## Chemistry

Describe how a buffer behaves. Your description should include an explanation of why the addition of NaOH to the HAc solution formed a buffer. What happens to the pH when a small quantity of a strong acid or base is added to a buffer solution? What happens

9. ## physics

assume that a 50 kg skater on level ice has built up her speed to 30km/hr.how far will she coast before the sliding friction dissipates her energy? assume the friction coefficient is 0.01.

10. ## life orientation

Discuss 5 way in which the human or enviromental problem impacts on the community

11. ## physics

a 70 kg astronaut is loaded so heavily that he can jump only to a height of 10 cm on earth.how far can he jump on the moon?

12. ## Life orientation

Dxuscuss 5 way in which the human or invromental problem impact on the community

13. ## physics

from what height can a 1 kg falling object cause fracture of the skull?assume that the object is hard and the area of contact with the skull is 1 cm sq. and that the duration of the impact is 10^-3 sec.rupture strength for skull is 10^8N/m^2

14. ## maths-trignometry

The value of (secpi/7)+(sec3pi/7)+(sec5pi/7) is

15. ## Physics

Suppose that the light bulb in the figure is a 61.8-W bulb with a resistance of 218 Ω. The magnetic field has a magnitude of 0.37 T, and the length of the rod is 0.59 m. The only resistance in the circuit is that due to the bulb. What is the shortest

16. ## PHYSICS

Suppose that the magnetic field in the figure below has a magnitude of 1.1 T, the rod has a length of 0.86 m, and the hand keeps the rod moving to the right at a constant speed of 3.4 m/s. If the current in the circuit is 0.044 A, what is the average power

A flat circular coil with 97 turns, a radius of 4.04 10-2 m, and a resistance of 0.528 Ω is exposed to an external magnetic field that is directed perpendicular to the plane of the coil. The magnitude of the external magnetic field is changing at a rate

18. ## math

Calculate without using tables or calculators log 450 and log 324 given log 2 =0.3010 and log 3 =0.4771

asked by John Makotamo
19. ## statstics

The lengths of the eggs of a species of bird are roughly normally distributed, with a mean of 32 mm and an SD of 1.2 mm. 1.Approximately what is the 99th percentile of the lengths? Give your answer in mm but please do not enter the units. 2.Approximately

What are the core business activities of absa ,nedcor and anglo american listed on top of the jse csr index?

asked by Ntebo matla
21. ## Math

Approximately 50% of the eggs have lengths in the range 32 mm plus or minus ____________ mm

22. ## University Physics

In a two-dimensional tug-of-war, Alex, Betty, and Charles pull horizontally on an automobile tire at the angles shown in the overhead view of Fig. 5-33. The tire remains stationary in spite of the three pulls. Alex pulls withe force Fa of magnitude 220N

asked by Brandon Ochoa
23. ## science

If the block has a mass 12.3 kg and slides a distance of 6.9 m down the inlcine, calculate the distance x the spring is compressed if the coefficient of kinetic friction between the block and the incline is 0.3 and the spring constant is 17.4 N/m. Input

24. ## Physics (Buoyancy)

A Cuboid with lenght as 6m and breadth as 3m, is floating in a lake. A man comes and sits on it and it sinks 1cm, then find the weight of the man. (Take g=10 m/s -2)

asked by Krishnam Kumawat
25. ## precalculus

A rectangular field is to be enclosed by a fence and divided into three equal rectangular parts by two other fences. find the maximum area that can be enclosed and separated in this way with 1200m of fencing.

26. ## English

Does this sentence need any other puncation than a period at the end. Fred said the distributor cap on my car is cracked.

27. ## math

Find inverse of [1/(x-2)]+3 and 2(x-4)^2 + 5

28. ## math

for what value of k are the roots of the quadratic equation (k+4)x*x+(k+1)x+1=0?

29. ## Business Math

Oakwood plowing company purchased two new plows for the upcoming winter. Oakwood must make a single payment of 25,03 to pay for the plows. As of today he has \$24,200. Asuume the Oakwood puts the money in the bank today, what rate of interest will it need

30. ## Physics

A worker drives a 0.460 kg spike into a rail tie with a 2.16 kg sledgehammer. The hammer hits the spike with a speed of 64.5 m/s. If one third of the hammer’s kinetic en- ergy is converted to the internal energy of the hammer and spike, how much does the

31. ## algebra

The current I in an electrical conductor varies inversely as the resistance R of the conductor. The current is 50 amps when the resistances is 20 ohms. What is the current when the resistance is 60 ohms?

32. ## Physics

The amount of internal energy needed to raise the temperature of 0.26 kg of water by 0.3C is 326.5 J. How fast must a 0.26 kg baseball travel in order for its kinetic energy to equal this internal energy? Answer in units of m/s

33. ## chemistry

10g of silver nitrate solution is added to 10g sodium chloride solution? what change in mass do you except after the reaction and why?

asked by nitin jangid ,palwal
34. ## math

Calculate the lenght of a rectangle with area 350cm and breadth 50mm.

35. ## math

Calculate the breadth of a rectangle with lenght 120mm and area 960m

36. ## math

Calculate the breadth of a rectangle with lenght 120mm and area 960m

37. ## Math

Calculate the side lenght of square with area 25m

38. ## chem

calculate the volume of dinitrogen tetrafluoride that has the same number of atoms as 10 L of argon under the same pressure ans temperature

39. ## Math

Calculate the area of a triangle with base equal to 18cm and height equal to 9cn

40. ## Math

Calculate the height of a triangle with base equal to 142cm and area equal to 62,48cm

41. ## Statistics

As reported in Runner's World magazine, the times of the finishers in the new york 10 km run are normally distrubted with a mean of 1.02 hours and a standard deviation of 9 minutes. Let X denote finishing time for the finishers. Then, A. Find the

42. ## stats

Opisthotrochopodus n sp. is a polychaete worm that inhabits deep sea hydrothermal vents along the Mid-Atlantic Ridge. According to an article by Van Dover et al. in Marine Ecology Progress Series (1999, vol 181 pp 201-214), the lengths of female polychaete

43. ## Chemistry I

If 30.0 mL of 0.2 M nitric acid and 30.0 mL of 0.25 M solution of sodium hydroxide are mixed, what is the molarity of sodium nitrate? Assume that total volume of the solution after mixing is equal 60.0 mL.

44. ## calculus

The total number of people infected with a virus often grows like a logistic curve. Suppose that 15 people originally have the virus, and that in the early stages of the virus (with time,t , measured in weeks), the number of people infected is increasing

45. ## biomechanics

you are trying to lift a 10 kg dumbbell by pulling upward on it with a 108.1 N force. what wil lthe acceleration of the dumbbell be as a result of this force?

46. ## Physics 11th Grade "HEAT' 2

1) Emily is testing her baby's bath water and finds that is too cold,so she adds some hot water from kettle on the stove. If Emily adds 2.00 kg of water at 80.0 degree celcius to 20.0 kg of bath water at 27.0 degree celcius , what is the final temperature

47. ## math

Jack and Diane went to the movies. They each paid the same amount for an admission ticket. Together, they spent \$12 on snacks. The total cost of admission and snacks for Jack and Diane was \$26. How much was each admission ticket? Choose a variable. Write

48. ## Math: Please check

A playground is shaped like a rectangle with a width 5 times its length (L). What is a simplified expression for the distance between opposite corners of the playground? A.) L square root 26 B.) 5L C.) 26L^2 D.) 6L Thanks

49. ## Electronics

Two resistors of 15ohms and 5ohms are connected in parallel.this parallel combination is connected in a series with a third resistor of 10ohms.the whole circuit is then connected across a 40 volts supply. 1.determine the resistance of the circuit. 2.the

50. ## Physics

13. The graph at right shows the angular velocity as a function of time for the blade of a fan. The blade moves in a circular path. a. If θ = 0 rad at t = 0 s, what is the blade’s position at t = 1.5 s? b. At what time will the blade have completed 11

51. ## Math: Please check

Simplify: -11 square root 112 *A.) -44 square root 7 B.) -176 square root 7 C.) -27 square root 7 D.) 4 square root 7 Thank You

52. ## Derivatives

what is derivative of sin^2 (3x-1)^2 ? dy/dx (sin^2 (x))= 2 sin x cos x dy/dx (3x-1)^2= 6(3x-1) chain rule? = 2 sin ((3x-1)^2) cos ((3x-1)^2) * 6(3x-1) Please help. Thank you

53. ## math problems

ã7/11 rationalize the denominator and simplify

54. ## stats

scores on a university examination are normally distributed with a mean of 68 and standard deviation of 9. What percetnage of students scores above 77? The answer is 16% according to the professor that is correct. But I don't understand how the professor

55. ## algebra

For the years 2010 to 2050, the projected percentage P of the U.S. population that will be 18 to 24 years old during year t is estimated by P= -0.025t+ 60.35. complete the table t 2010 2020 2030 2040 2050 p use the table to find the year when the

56. ## Life Orientation

what,according to the Basic conditions of employment Act applies wiht regard to the contraventions that you've identified?

57. ## Chemistry

A solution has a mass of 95.00g and a density of 2.147 g/mL. What is the volume of the solution?

58. ## PHYSICS

Hi! I have some questions from a study guide in my physics class, and they give me the answer, but I have to show how to get the answer. I did most of them, but need help with this. All I need is a formula, please. :)Thank you! Here it is: A skier with a

59. ## calculus

A new college textbook edition typically generates most of its sales in the year of its publication. Sales drop off in subsequent years as a result of competition from the used book market. Suppose that the annual sales of a particular textbook may be

60. ## calculus

R(t) = −131t − 749.5 million dollars per year and the rate of change in the annual operating profit may be modeled by P(t) = 12t + 76 million dollars per year, where t is the number of years since the end of 1999. Determine the accumulated change in

61. ## physics

A parallel capicitor is made of two plates with cross sectional area A which are separated by a distance d (with a vacuum between the plates). The capacitor is connected to a battery until a charge Q is stored on it and a total potential difference VC is

62. ## Cal

Differentiate the function. f(x) = sin(x) ln(2x)

63. ## Help Ms.Sue Please

1.Find the lateral area of a cone with a radius of 7 ft. and a slant height of 13 ft. Use 3.14 for ð and round to the nearest tenth. 439.6 ft2 324.5 ft2 571.5 ft2 285.7 ft2 2.Find the surface area of a square pyramid with a base length of 24 cm and a

64. ## Cos-Derivative

y= (cos^3 x) (cos 3x) I got -3 sin(3x) cos^3x - 3 sin(x) cos (3x) cos^2 (x) using the product rule Is this right? Thanks.

65. ## science

A ball dropped from a height of 10m loses 40% of its energy after impact on ground. How much height will it gain after one impact?

66. ## science

A ball dropped from a height of 10m loses 40% of its energy after impact on ground. How much height will it gain after one impact?

67. ## chem 101

75.0 G tartaric acid in 1 liter is what molarity (moles/liter) mw= 150.087g/mol

68. ## maths-stastics

Find the mean for the following data variable=4,6,8,10,12 freqency=4,8,14,11,13

69. ## Electronics

Rseries=R1+R2 =15ohms+10ohms =25ohms

70. ## Calculus

If f(3)=−3, g(3)=9, f′(3)=1, and g′(3)=2, Find (f/(f−g))′(3).

71. ## inequality

find the solution to the following inequality 2(2x-6)>x+3, then graph the solution.

72. ## chemistry

In a measurment 0.1M Kmno4 is used.determine the volume of solution required to react with 0.158M Na2s2o3 required?

asked by Abhishek Bhargav
73. ## math

NOTE: this is for advanced functions, NOT physics A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again in a total of 4 seconds. The farthest the baseball

74. ## math

Determine the equation of the function that has the indicated transformation applied to it. f(x)= 3(x+1)^2-2 Is it 6(x+1)^2-2? or 9(x+1)^2-2?

75. ## Chemistry

What is the molarity of nitrate ions in a solution containing 2.20 mg of Mg(NO3)2 dissolved in 7.35 L of water?

76. ## Help Damon Ms.Sue

1.Find the surface area for a sphere with a radius of 10 feet. Round to the nearest whole number. 1,256 ft2 4,189 ft2 1,089 ft2 1,568 ft2 2.Find the volume of a sphere with a radius of 10 feet. Round to the nearest whole number. 1,257 ft3 4,187 ft3 1,089

77. ## geometry

From point Q on circle P, an arc is drawn that contains P. Find the measure of the arc AQB that is cut off.

78. ## Chemistry

Rank the following compounds in order of their solubility in water. (most soluble = 1 -- least soluble = 4)--Note that for the same solubility rank the same (a tie). (CH3)2CHOH HOCH2CH(OH)CH2OH CH3CH2OH (CH3)3COH

79. ## Math

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)

80. ## Math

Use implicit differentiation to find the slope of the tangent line to the curve y/( x + 4 y) = x^4 – 4 at the point (1,-3/13)

82. ## science

According to Newton's second law of motion, _____? A. F = mv B. F = m/a C. a = Fnet /m D. F = ma I think it is B..?

83. ## Chemistry Equilibrium

Which of the following conditions is always true at equilibrium? deltaG=0, Q=1, K=1, deltaG=deltaG(standard), deltaG(standard)=0, Q=0, deltaG(standard)=1 I'm so confused, please help!

84. ## Science

What was the main difference between Dalton's model of the atom and the model that was first developed by the Greeks?

85. ## chemistry

For the reaction 2A(g) + B(aq) + 3C(l) D(s) + 3E(g), the concentrations at equilibrium are found to be: A: 2.3x10^3 Pa B: 1.8x10^-2 M C: 15.8M D: 12.5M E: 5.6x10^4 Torr i got an answer of 1.83x10^-13 is this correct??

86. ## Word Problem-Calculus

A spherical balloon is being inflated in such a way that its radius increases at a rate of 3 cm/min. If the volume of the balloon is 0 at time 0, at what rate is the volume increasing after 5 minutes? my answer is 45 cm/min. is this right. thanks

87. ## Derivative-Word Problem

Volume in liters of antifreeze remaining in a leaking radiator after t minutes is V= 20- 2t- 0.1t^2 a) how long does it take to drain the antifreeze mixture from the radiator? i got t= 10 b) how fast is volume changing when t=5? i got 9.75 is this right.

88. ## Math

An airplane is going 300 mph at a bearing of N 55 degrees E. The wind is blowing 30 mph due East. What is the actual speed and direction of the plane?

89. ## Slope- Derivative

Find the slope of f(t)= sqrt((1-sin (2t)) a) at point (0,1) i got -1 b) at origin i got 1 is this right thanks

90. ## Math/230

A 350 word response how to compute probabilities using z score

91. ## english

calculate the mass and prepare 200ml 0.1M, 250 ml 0.2 N, 100 ml 3% of NaCl, Na2Co3 solution

92. ## language arts

What adjective could i use for the following sentence? What a_______ maps this atlas has!

93. ## Is this correct?

What values (c) if any are predicted by the mean value theorem for the function f(x)= (x-2)^3 on the interval [0,2]? I got x= 4 and x=0, since x=0 is within the interval I chose that as my answer. Thank you.

94. ## Chemistry

A sample of an oxide of antimony (Sb) contained 51.5 g of antimony combined with 16.9 g of oxygen. What is the simplest formula for the oxide?

asked by Greg PLS HELP
95. ## Chemistry

If an unknown metal M is .521 g how do you calculate it's atomic mass?

96. ## Chemistry

If an unknown metal M is .521 g how do you calculate it's atomic mass?

97. ## chem

A sample of an oxide of antimony (Sb) contained 51.5 g of antimony combined with 16.9 g of oxygen. What is the simplest formula for the oxide?

asked by Greg PLS HELP
98. ## Physics

What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

99. ## Physics

What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

100. ## Physics

What effect does a person's distance from a mirror have on the minimum mirror length required to produce his or her complete image?

101. ## Education/Technology

A program that helps you create tests by providing you with a database of questions is A) a test generator. B) an academic tool. C) an electronic gradebook. D) an Internet service provider. I believe the answer is A, but wanted a second opinion.

102. ## English

Hello can you need the coma where I placed it? Thanks for your help. In keeping in mind the needs of the client, I will be able to meet the goals of the client.

103. ## math

The Grade 8 students had a graduation dinner. They paid a flat rate of \$125 for the use of the hall, plus \$13 for each student who attended. The total cost of the dinner was \$944. How many students attended the dinner ? Write an equation to solve the

104. ## Chemistry

A solution of hydrochloric acid (HCl) contains 22.5% hydrochloric by mass. What is the molality of this solution I'm not sure how to start this problem...

105. ## chemistry

One step in the isolation of pure rhodium metal (Rh) is the precipitation of rhodium(III) hydroxide from a solution containing rhodium(III) sulfate According to the following balanced chemical equation: Rh2(SO4)3(aq)+ 6NaOH(aq)→ 2Rh(OH)3(s)+ 3Na2SO4(aq)

106. ## Education/Technology

With the advent of digital technologies, A) audio and video support technologies were no longer considered valid media. B) digital audio and video technologies joined more traditional technologies as supports for instruction. C) research proved that

107. ## ccc

Find the equation of the line containing the point whose coordinates are (1, 2)and parallel to the graph of 5x + y = −4.

108. ## Chemistry

Write a balanced equation for the following: aqueous barium chloride reacts with aqueous sodium chromate to form aqueous sodium chloride plus solid barium chromate.

109. ## CHEMISTRY

40g of antimony combine with 80g of oxygen to form an oxide of antimony what is the simplest formula of the oxide

110. ## physics

One airplane travels due north at 300 km/h while another travels due south at 300 km/h. Select the false statement. The airplanes have the same speed The airplanes have the same velocity

111. ## Math

if a rubber band can be stretched to a circular shape that has a radius of 3.4 inches. how many 1.3-mm diameter toothpicks could of fit within it? (1 inch = 25.4 mm)

asked by Joshua baez
112. ## math

ISABEL WANTS A COAT THAT COAST \$60. SHE HAS SAVED \$42 . WHAT FRACTION OF THE AMOUNT SHE NEEDS TO SAVED.

113. ## chem

Consider the fermentation reaction of glucose: C6H12O6 ----) 2C2H5OH+2CO2 A 1.00-mol sample of C6H12O6 was placed in a vat with excess yeast. If 35.1 g of C2H5OH was obtained, what was the percent yield of C2H5OH?

114. ## cHEM

It is found that 1.431 g of element X contains 7.509 × 1021 atoms. The atomic mass of X is?

115. ## Math

What is the perimeter of an equilateral triangle with an altitude of 15m?

116. ## math

5ã2x^3-xã18xy^2 simplify as much as possible (5+4ã2)(3+4ã10)multiple and simplify as much as possible

asked by the last two
117. ## Chemistry

An organic compound that has the empirical formula CHO has a molecular mass of 145 amu. Its molecular formula is?

asked by Stefhanie help me pls
118. ## MATH

ISABEL WANTS A COAT THAT COAST \$60. SHE HAS SAVED \$42. WHAT FRACTION OF THE AMOUNT SHE NEEDS TO SAVED?

119. ## Physics (Algerbra-based)

A particle is moving clockwise around a circle with a radius 3.31 m. The magnitude of the total acceleration of the particle at the given instant is 14.3 m/s^2; the angle between the vector of total acceleration and the radius-vector of the particle is

120. ## Chemistry

An aqueous antifreeze solution is 31.0% ethylene glycol (C2H6O2) by mass. The density of the solution is 1.039 g/cm3. Calculate the molality of the ethylene glycol.

121. ## math

Determine the equation of the function that has the indicated transformation applied to it. f(x)= 3(x+1)^2-2 reflection across x-axis and stretched vertically by factor of 3

122. ## Life Orientation

What is meant by discrimination?

123. ## Chem

When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

124. ## math

NOTE: this is for advanced functions, NOT physics A 2m length of board rests with one end on the floor and the other end on a small stack of bricks. A baseball is rolled up the board and back down again in a total of 4 seconds. The farthest the baseball

125. ## MATH

JAIME MAKES \$150 A WEEK. HE SPENT \$112. WHAT FRACTION OF HIS WEEKLY PAY HAS HE SPENT?

126. ## Math

AM I RIGHT: SA:2*(3.14)R*R + 2*(3.14)*R*H R-4 & H-10 2*3.14*4*4= 100.48 2*3.14*4*10=251.2 SA- 25240.576 ________________________________________ V-3.14*R*R*H V-3.14*4*4*10 V-502.4 ________________________________________ V-L*W*H V-5*9*7 V- 315

127. ## Chem

The amount of energy needed to heat 2.00 g mercury from 50.0°C to 85.0°C is 9.87 J. The specific heat capacity of this sample of mercury is

128. ## chem

A 6.75-g sample of gold (specific heat capacity = 0.130 J/g °C) is heated using 55.8 J of energy. If the original temperature of the gold is 25.0°C, what is its final temperature?

129. ## Chemistry

A 100.0 g sample of water at 27.0°C is poured into a 77.4 g sample of water at 89.0°C. What will be the final temperature of the water?

130. ## Chemistry

Which of the following processes is exothermic? a.rolling a ball up a hill b.boiling water in a beaker to make steam c.allowing meat to thaw after taking it out of the freezer d.reacting hydrogen and oxygen gases to make water e.a popsicle melting on a

131. ## math

A person purchased a \$250000 home 5 years ago. he paid 20% down and signed a 30-year mortgage at 6% compounded monthly. what is the unpaid balance of the loan (now that 5 years are gone). i need answer with explanation

132. ## Math

Three Friends went to the sub shop for lunch. They ordered the 3Ft sub made with 1/4 Ham, 1/5 roast beef, 3/8 turkey. The rest of the sub is made up of lettuce, tomato, and onions. What fraction of the sub is made up of lettuce, tomato, and onions ?

133. ## English

Could you please check the grammar in the following sentences? Thank you very much in advance. 1.I had just turned off the light to go to sleep and I was dozing off when I felt/experienced the greatest fear in my life 2.He had tried to get in touch with

134. ## Math

If the two boys ate the following amounts bryan 5/16, kevin 1/6, how much did the third person marco eat ?

135. ## calculus

Consider the interval I=[6,7.6]. Break I into four subintervals of length 0.4, namely the four subintervals [6,6.4],[6.4,6.8],[6.8,7.2],[7.2,7.6]. Suppose that f(6)=19, f'(6)=0, f'(6.4)=−0.5, f'(6.8)=−0.1, and f'(7.2)=−0.1. What is the approximate

136. ## Chemistry

True or false? The calorie is defined as the amount of energy (heat) required to raise the temperature of one gram of water by one degree Celsius.

137. ## Geometry

The coordinates of the vertices of a parallelogram are given. Find the possible coordinates for the fourth vertex. L(0,4), M(6,0),N(2,4)

138. ## MATH

TERRY HAS A BOARD THAT IS 4 YARDS LONG. HOW MUCH NEEDS TO BE SAWN OFF TO MAKE THE BOARD 2 FEET 8 INCHES LONG?

139. ## math

Sally answered 90% of the math test questions and 80% of the history test questions correctly. If each test had 50 questions, how many questions in all did she answer correctly? I think that she answered 85 questions in all that were correct. Am I right?

140. ## Geometry

Assuming that the circumference of each circle passes through the centers of the other two, and that the radius of each circle is 1, what is the total combined area?

141. ## Calculus

Let y=tan(2x+5). Find the differential dy when x=1 and dx=.3 Find the differential dy when x=1 and dx=.6

142. ## math help

how to write an expression using 23 and 46

143. ## Chemistry

When 20.0 g C2H6 and 60.0 g O2 react to form CO2 and H2O, how many grams of water are formed?

asked by pls help
144. ## HELP PLEASE

Let y=tan(2x+5). Find the differential dy when x=1 and dx=.3 Find the differential dy when x=1 and dx=.6

145. ## AP Statistics

12) Which of the following statements is true? a) The sampling distribution of the difference between two proportions will always be normal. b) When comparing two population proportions, either sample proportion can be used as the unbiased estimate of the

146. ## MATH

THE RATIO OF A DOGS TO CATS AT THE PET STORE IS 1:4. IF THE PET SHOP HAS 7 DOGS, HOW MANY CATS DOES IT HAVE?

147. ## Math

The difference between the prices of two bikes is \$22. The sum of the prices is \$328. How much does each bike cost?

148. ## AP Statistics

Consider the following data collected in two recent surveys of whether voters in cities A and B favor a ballot proposition in the next election. City Sample Size In Favor A 615 463 B 585 403 Suppose you're going to conduct a significance test to see if

asked by Math Whizz
149. ## Math

If there are 51 students on a bus and 2/3 got off how many students got off the bus

150. ## fractions

Annie walked her dog 2 1/4 miles from her house to the dog park and 3/7/8 miles around the park.Then she walked the same distance home.How many miles did she walk in all?

151. ## physics

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?

152. ## math

Marco's goal is to eat only 2,000 calories each day. One day for breakfast he consumed 310 calories, for lunch he consumed 200 more calories than breakfast, and for dinner he consumed 800. Did he make his goal? I added 310+510=810+800 and got 1,610 not

153. ## physics

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?

154. ## LAST THING!

2sec^2(2x+5) dx what's the answer when dx is .3 it keeps saying i'm wrong with the one i've found

155. ## macroeconomics

assume that American rice sells for 100.00 per bushel, japanese rice sells for 16,000 yen per bushel, and the exchange rate is 80 yen per 1 dollar. what would be your profit per bushel of rice, and how you can make a profit in this situation

156. ## Spanish

Can someone help me peer edit my work the second paragraph is my conclusion, this is about diet: Dieta Su dieta es muy importante para mantener el bueno salud. Comiendo comidas saludables ayudas su mantener fuerte un cuerpo y perder peso o subir peso, pero

157. ## math

Jan is making a pencil holder out of plastic canvas.The pencil holder will be 4 inches high. It will not have a top.The perimeter of the square base is 17.64 inches.How much plastic canvas does Jan need?

158. ## math

A balance scale is perfectly balanced with two blocks on one side and ten weights on the other. If each weight equals 2.0 grams, how much does one block weigh? Please answer and explain.

159. ## nonfiction

When does the Narrative of Sojourner Truth take place?

160. ## Algebra

Minimum Wage. In 1995, the minimum wage was \$4.25 per hour, and by 2010 it had increased to \$7.25 per hour. a) Find the slope of the line passing through the points (1995, 4.25) and (2010, 7.25) b) Interpret the slope as a rate of change. c) If this trend

161. ## Calculus

Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

162. ## math

A balance scale is perfectly balanced with two blocks on one side and ten weights on the other. If each weight equals 2.0 grams, how much does one block weigh?

163. ## Physics 1

An astronaut in her space suit has a total mass of m1 = 76.9 kg, including suit and oxygen tank. Her tether line loses its attachment to her spacecraft while she's on a spacewalk. Initially at rest with respect to her spacecraft, she throws her oxygen tank

164. ## human life

The human population of the world is over 6 billion. The increase of the human population P (in billions) can be approximated using the following formula: P = 0.073t + 6.08, where t is the number of years after the year 2000. Use the formula to predict how

165. ## Math

Find the number of each kind of object in the collection. Sue's Card Collection 8 packs of baseball cards 3 fewer packs of hockey cards than football cards 17 packs in all

166. ## CHEMISTRY: URGENT DRBob222

A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and 80cm3 of alkali were required. 1. Write an equation for the

167. ## math

Marvin has a 27-foot ladder. Safety standards dictate that the base of a 27-foot ladder should be placed 7 feet from a vertical wall. How far above the ground will the top of the ladder be on the wall, in feet? Round your answer to the nearest hundredth.

168. ## Geography

What are three colonies between 70 and 75 degrees west longitude???????

asked by Khaii jack
169. ## Math

what if you divide circumference by diameter and don't get pi ? What does that mean about the circle (because today i got numbers that were exactly over pi and some were even under)?

asked by Alexis Thompson

Hi I would like proofreading/feedback on my broadcasting story. BTW It's in all caps because that's how our teacher told us to write it. A MICHIGAN ATTORNEY HAS FILED CHARGES AGAINST THE WIFE OF FORMER BAY CITY BUSINESSMAN… M. VICKTORIA WILSON—THE WIFE

171. ## math

Jan is making a pencil holder out of plastic canvas.The pencil holder will be 4 inches high. It will not have a top.The perimeter of the square base is 17.64 inches.How much plastic canvas does Jan need?

172. ## Happy π Day to all mathematicians

Today, March 14, at 1:59 was a very special time.

173. ## math

Earth's mass, in kilograms, is 5.97x10^24. the moon's mass is 7.34x10^22. How many times greater is Earth's mass (in scientific notation)?

174. ## calculus

Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

175. ## ALGEBRA

SOLVE FOR THE VARIABLE X+3=7

176. ## algebra

solve for variable 4x=20

177. ## Science help.

1. The ___ is the outer, thinnest layer of your skin, which houses sweat pores. (1 point) epidermis dermis fatty layer hair 2. One of the purposes of sweat glands is to release waste products, such as water and _____. (1 point) blood dirt sugar salt 3.

178. ## Math

If someone is attached to a 20 ft rope, which is attached to the corner of a building, how far can they move? If the bulding is 22 ft X 15 ft?

179. ## chemistry

A sample of chlorine gas is collected by water displacement at 23C. If the atmospheric pressure is 751 torr, what is the partial pressure due to the chlorine?

180. ## Math

How to divide 150 by 3.6 please tell me with steps I tried it several times but can't seem to figure it out!!!

181. ## biology

In this problem, 6 amino acids have been randomly selected from the 129 amino acids in lysozyme; they are shown as solid spheres. The remainder of the protein is shown as a cloud of tiny dots. Your task is to find out which of the 6 amino acids are on the

182. ## Clueless in calculus

Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) A) is f an even or odd function? Justify answer. B) find the domain of f. C) find the range of f. D) find f'(x)

183. ## more Broadcasting/english

May I get some feedback on this one as well please? GENERAL MOTORS MAY INVEST 38 MILLION DOLLARS TO EXPAND ITS LANSING GRAND RIVER ASSEMBLY PLANT… THIS MOVE COULD BRING 150 JOBS. THE PRESIDENT AND CEO OF LANSING ECONOMIC AREA PARTNERSHIP (LEAP)

184. ## Chemistry

If the molality of a CaCl2 solution is .100 mol/kg, and was made from 500.0 mL of water, how many grams of CaCl2 were needed to make the solution? Step by step would be appreciated!

185. ## physics

When a driver brakes an automobile, friction between the brake disks and the brake pads converts part of the car's translational kinetic energy to internal energy. If a 1280 kg automobile traveling at 30.8 m/s comes to a halt after its brakes are applied,

asked by Jayde Larson
186. ## physics

A rocket moves upward, starting from rest with an acceleration of 30.5 m/s2 for 3.39 s. It runs out of fuel at the end of the 3.39 s but does not stop. How high does it rise above the ground?

asked by John Miller
187. ## CHEM

A 0.4647-g sample of a compound known to contain only carbon, hydrogen, and oxygen was burned in oxygen to yield 0.8635 g of CO2 and 0.1767 g of H2O. What is the empirical formula of the compound? i got C3H3O2 IS IT RIGHT?

188. ## english

Circle the word with two vowels together where each vowel has a separate vowel sound. Then underline the letters that stand for the two different vowel sounds. 1 clean, paint, patio

189. ## math

Joe says that knowing 2x3 helps him know 4x6 is he right explain

190. ## Chemistry

What type of reaction will occur when an aqueous solution of lithium chloride is mixed with an aqueous solution of ammonium sulfate?

191. ## english

What is is in shirly english

asked by sarah sosnin
192. ## Chemistry

What is the C-C-H bond angle in the molecule H2CCO?

193. ## Chemistry

How many valance electrons are there in [(C2H5)4N]+ ?

194. ## Chemistry

What is the wavelength of an electron traveling at 7.59% of the speed of light?

195. ## Chemistry

A compound containing only carbon, hydrogen and oxygen is subjected to elemental analysis. Upon complete combustion, a .1804g sample of the compound produced .3051g of CO2 and .1249g of H2O. What is the empirical formula of the compound?

196. ## Let f be the function be defined by f(x)=5^((2x^2)

Let f be the function be defined by f(x)=5^((2x^2)-1)^(1/2) find the range of f without using a calculator

197. ## artist

Is it possible for a band or artist to make topical or political commentary in a song today while focusing on turning a profit?

198. ## History

Hi can you help me find a website for teens in the 1920's and a journal on it.

199. ## english

circle the words with two vowels together where each vowel has a separate vowel sound, then under line the letters that stand for the two different vowel sounds. 2. audio, faith, search. 3. greed, journal, rodeo 4. either, medium, southern. 5 beach, pound,

200. ## math

Solve for x in the equation (x − 7)^2 − 4 = (x + 1)^2.

201. ## Math

Bus A leaves interchange 6 minutes, Bus B leaves 12 minutes later, Bus C leaves 18 minutes later. If all buses leave at 6 am when will all 3 buses leave at the same time again. Kindly show workings and explantion to problem. Thank you

202. ## Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

203. ## Physics

What is the total kinetic energy if a 0.30 kg block is sliding on a smooth horizontal surface at 2.5 m/s, heading towards a light spring that is in equilibrium?

204. ## Education

1. in a study examining preschoolers' responses to their peers distress, researchers used ___ to record each instance in which a child cried, followed by other children's reactions. a. time sampling b. systematic collection c. event sampling d. structured

205. ## Math

What is an easy drawing that has a lot of circles in it.

206. ## algebra

solve for variable x/8=42

207. ## physics

A 1.85 m tall basketball player attempts a goal 9.3 m from a basket (3.05 m high). If he shoots the ball at a 45° angle, at what initial speed must he throw the basketball so that it goes through the hoop without striking the backboard?

asked by John Miller
208. ## Math

Which is greater 0.9 x 2 or 2 + 9? My answer is 0.9 + 2 is greater because it equals 2.9 and 0.9 x 2 = 1.8.. Is this correct?

209. ## chemistry

When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of 1.0 M NaOH at 25.0 °C in a calorimeter, the temperature of the aqueous solution increases to 33.9 °C. Assuming the specific heat of the solution is 4.18 J/(g·°C), that its density is 1.00 g/mL, and

210. ## Social studies

About 40,000 kinds of flowering plants grow in

211. ## Math Probability

Using a standard deck of 52 cards find each probability. 1.)King, queen, or black card 2.)Spade or hearts card

212. ## statistics

A diabetes nurse educator believes that her patients have particularly bad control of their blood sugar. To test this she selected the fasting blood sugar values for 15 of the patients she saw this week. The national mean for patients with this level of

213. ## physics

If You do 100 j of work to elevate a bucket of water,what is its gravitational potential energy relative to its starting position?

214. ## Math

If there are 51 students on a bus and 2/3 got off how many students got off the bus

215. ## algebra

A boat can travel 16 km/h against the current.The same boat can travel 30 km/h with the current.find the rate of the boat in still water and the rate of the current. Could someone help me.it seams like an easy problem, but I am not getting there.Thank YU

216. ## fractions

Terry weighed his two cats at the veterinarian's office.Boots weighed 12 9/10 pounds. and Tiger weighed 13 1/4 pounds.What is the total weight of both cats?How can I explain this

217. ## writing prompt at least five sentences

describe why it is important to protect our forest .write at least 5 sentences convincing me why we should protect them.

asked by e a
218. ## math

In 2009, there were 12 million fewer acres of farm land in Arizona than there were in 1980. If the sum of acreage for these two years is 64 million acres, find the number of farm land acres in Arizona for each of these years.

219. ## writing

I need help how to describe why it is important to protect our forest. write five convincing sentences why we should protect them..

asked by e a
220. ## Math

Order from least to greatest 4/10,0.3,1/2

221. ## CHEMISTRY: URGENT DRBob222

Why was the reaction mixture titrated quickly? (question fom: A mixture of 0.50 mol of ethanoic acid and 1.00 mol of ethanol was shaken for a long time to reach equilibrium. The whole mixture was titrated quickly with 1.00 mol dm3 sodium hydroxide and

222. ## algebra 2

3n/(n2 -7n + 10) - 2n/(n2-8n+15)

223. ## calculus

R(t) = −131t − 749.5 million dollars per year and the rate of change in the annual operating profit may be modeled by P(t) = 12t + 76 million dollars per year, where t is the number of years since the end of 1999. Determine the accumulated change in

224. ## physics

A light spring with a spring constant of 105.0 N/m rests vertically on the table, as shown in (a) below. A 2.05 g balloon is filled with helium (0°C and 1 atm pressure) to a volume of 4.64 m3 and connected to the spring, causing the spring to stretch, as

asked by John Miller
225. ## science

wordy numbers: 622-4463 (let it do the work)

226. ## english

I wrote, Ms.Marcus is tall and a little bit skinny. What are the two sound effects in the line above? Which words are involved in each sound effect. Please help I'm not good with English class thanks :)

227. ## Math

Where do the perentheses go to solve this problem : 7 - 6 x 7 DEVIDE 5 + 7 = -43 2/3

228. ## Chem

40. If 12.0 gram of O2 is required to inflate a balloon to a certain size at 27 degrees C, what mass of O2 is required to inflate it to the same size and pressure at 81 deg C?

229. ## social studies

information on the preamble,declaration of natural rights, list of grievance, declaration of independence by U.S.

230. ## Algebra

Help Please!! Write the orderd pair describing the coordinates of each intercept : x-intercept: 17 : y-intercept: 3/4

231. ## social studies

the preamble: six goals for the U.S. Government. information on six goals for this

232. ## Algebra

The recommended daily intake (RDI) of a nutritional supplement for a certain age group is 600 mg/day. Actually, supplement needs vary from person to person. Write an absolute values inequality to express the RDI plus or minus 50 mg and solve it.

233. ## Algebra

Solve |6 - 4x| < -13

234. ## Algebra

Solve 1/5x - 3 = 1/2x - 1/5x

235. ## math

A student was asked to find the inverse of the function f(x)=3x-7. The student began the solution with the following: Write f(x) = 3x-7 as y = 3x-7 x= 3y-7 The student eventually got the right answer for f^(-1)(x) [inverse notation] but did not get full

236. ## Algebra

Solve 0.17y + 0.03(y + 9000) = 870

237. ## Algebra

Solve |4y – 3| > 8

238. ## physics

what factors can affect a bodies temperature rise?

239. ## health Ms. Sue please

1. The body's functions are slowed when alcohol reaches where? (1 point) The stomach The heart The liver The brain 2. Which statement is NOT true? (1 point) Regular use of alcohol can lead to addiction. Alcoholism can be cured. Someone cannot cause someone

240. ## physics

differences btw a window unit air-conditioner and split-unit air conditioner.(2)explain d working principle of a freeze dryer using a diagram

241. ## Math

3n/(n2 -7n + 10) - 2n/(n2-8n+15) thanks

242. ## Math

maria has a slice of pizza that is 1/6 of the pizza. Ben has a slice of pizza that is 1/3 of the pizza. Maria's slice is bigger. Draw pizzas to show how this is possible.

243. ## physics

Tarzan plans to cross a gorge by swinging in an arc from a hanging vine. If his arms are capable of exerting a force of 1720 N on the rope, what is the maximum speed (in meters/second) he can tolerate at the lowest point of his swing? His mass is 81.0 kg,

244. ## Chemistry

If 11.6 mL of 0.17 M MgCl2 are mixed with 24.9 mL of 0.58 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 10-11 for Mg(OH)2

245. ## Chemistry

A saturated solution of Mg(OH)2 is prepared having a large excess of Mg(OH)2. Sn(NO3)2 is added to the solution. Ksp = 1.8 10-11 for Mg(OH)2 and Ksp = 5.1 10-26 for Sn(OH)2. (a) What [Sn2+] is required to start the precipitation of Sn(OH)2? (b) What [Sn2+]

246. ## Question!!!!

Do advertisers tell the society what they want to hear just so they can make money?

247. ## Statistics

A coin is tossed 10 times. What is the probability that the third head will apear on the tenth toss?

248. ## English

The most important task related to reading is: A. reading speed. B. reading comprehension. C. taking notes. D. memorization. is it B

249. ## mathematics

the 1st term of arithmetic series is 2 .the 1st ,3rd and 11th terms are the first the terms of a geometric series. find the 6 terms of the arithemetic series

250. ## English

Speed reading is concerned with: A. how fast you read. B. the number of words read in a minute. C. reading rate as well as comprehension of what was read. D. recalling three main points in three minutes. is it C

251. ## math asap

I don't understand can you please help bedtime 1. (-5)-(-6)+(-1) 2. (-3.1)-(-7.5)+(+1.8) 3. (-9)+(-2)-(-6)+(-5) 4. (+5.2)+(-2.6)-(-3.7) 5. (-8)-(+7)-(+10) 6. (+4.5)-(-3.25)-(+1.5) Please answer all 6 if possible thanks!

252. ## English

Which is the better strategy in note-taking? A. Take as many notes as possible. B. Study your notes closer to exam time. C. Take notes according to chapter objectives. D. Notes should only include key words. is it A

253. ## College algebra

Answer the questions about the following functions. f(x) = 14^2/x^4 + 49 (a) Is the point (-sqrt 7,1) on the graph of f? (b) If x=1, what is f(x)? What point is on the graph of f? (c) If f(x)=1, what is x? what point(s) are on graph of f? (d)What is the

254. ## Chemistry

What concentration of SO32– is in equilibrium with Ag2SO3(s) and 3.20 × 10-3 M Ag ? The Ksp of Ag2SO3=1.50×10^–14 The ksp expression is 1.50×10^-14=(Ag^+2)^2(SO3^-2)/(Ag2SO3). Is the concentration 3.0×10^-9?

255. ## sociology

There is a disparity between theory and direct observation. Because theories are based on observations, how are these theories first developed in the absence of direct observations?

256. ## ecology

During the demographic transition of the eighteenth century, humankind led advances in mortlity and economy, leading to a prosperous population growth. What types of resources are necessary for population change and how might the availability of resources

257. ## sociology

How have families changed over time and what relationship does this have to population structure? Provide an example on one social institution that has been affected by these shifts in family composition?

feedback is appreciated, thanks in advance THOUSANDS OF JOBLESS MICHIGANDERS WILL RECEIVE LESS MONEY IN THEIR WEEKLY EMERGENCY UNEMPLOYMENT CHECKS. MORE THAN 74 THOUSAND PEOPLE IN MICHIGAN RECEIVE BENEFITS THROUGH FEDERALLY FUNDED EMERGENCY UNEMPLOYMENT

259. ## Chemistry

A solution is 5.0× 10–5 M in each of these ions: Ag , SO42–, Cl–, CO32– Which precipitate will form? Ag2SO4 (Ksp = 1.12× 10–5) AgCl (Ksp = 1.77× 10–10) Ag2CO3 (Ksp = 8.46× 10–12)

260. ## Language Arts

I will give the questions and my answers. Someone check it please. Read the passage below and answer the questions that follow. To the Top “Great works are performed, not by strength, but by perseverance.” -Samuel Johnson Have you ever wanted to give

261. ## Chemistry

Which of the following will be more soluble in an acidic solution than in pure water? Be(OH)2 Ag2SO4 RbClO4 CuCN Cul

262. ## English

Africa was one of the sites where agriculture began. Archaeological investigations suggest that knowledge of cultivation moved west from the ancient Judaea (southern Palestine) and arrived in the Nile Delta in Egypt about the fifth millennium before

263. ## Help! stuck on this math question

3n/(n^2 -7n + 10) - 2n/(n^2-8n+15)

264. ## Chemistry

If 18.7 mL of 0.14 M MgCl2 are mixed with 24.2 mL of 0.52 M NaOH, what will be the final concentration of Mg2+ in solution when equilibrium is established? Assume the volumes are additive. Ksp = 1.2 10-11 for Mg(OH)2.

265. ## Math

Aubrey spent 2/7 of her money and gave 1/4 of the remaining money to her hungry parents. she had \$120 left. How much did she have left?

266. ## Math

The median score on attest is 90. Is it possible to add two or more scores to the data and still have a median score of 90? Explain

267. ## Maths

data with mean of 32, standard deviation of 1.2, What is the 99th percentile score?

268. ## Math

27a4b7 (A-1)3 ----------- • ------------ = ? 3a2-6a-3 9ab