# Questions Asked onMarch 28, 2013

1. ## Chemistry

1. Which of the following metals is oxidized by calcium ions? *potassium zinc iron lead 2. The first electrochemical cell was invented by ____. Michael Faraday *Alessandro Volta James Maxwell Benjamin Franklin 3. Why can't a lead storage battery be

2. ## Trigonometry question?

Let ABCD be a square, and let M and N be the midpoints of BC and CD respectively. Find sin

3. ## Math Plz help

survey about the student government program at a school finds that of 245 students: 218 students like the program 27 students think the program is unnecessary If a circle graph were made from this data, what would the measure of the central angle be for

4. ## Statistics

Hello. I would like to ask a college statistics question. Q. One hundred draws are made at random with replacement from the box [1,2,2,5]. The draws come out as follows:17 [1]'s, 54 [2]'s, 29 [5]'s. Fill in the blanks, using the options below; show work.

5. ## Public Speaking

For communication to take place, there has to be: A. transmission of the message. B. medium. C. sharing of meaning. D. absence of noise. is it A 2. Which is NOT a benefit of studying public speaking? A. Creates good first impression on others B.

6. ## standardized Testing

Is it possbile to score in the 100th percentile on a given standardized test?I would think no but why not?

7. ## Spanish

5. Fill in the blank with the correct form of the verb jugar. yo __________ My Answer: yo juego 6. Fill in the blank with the correct form of the verb jugar. nosotros __________ My Answer: nosotros jugamos 7. Fill in the blank with the correct form of the

8. ## AP Macroeconomics

Japan, the European Union, Canada, and Mexico have flexible exchange rates. Suppose Japan attracts an increased amount of investment from the European Union. Using a correctly labeled graph of the loanable funds market in Japan, show the effect of the

9. ## chem

In an excess of NH3(aq), Cu2+ ion forms a deep blue complex ion, Cu(NH3)42+, which has a formation constant Kf = 5.6 1011. Calculate the Cu2+ concentration in a solution prepared by adding 4.8 10-3 mol of CuSO4 to 0.500 L of 0.32 M NH3.

10. ## physics

At most, how many bright fringes can be formed on either side of the central bright fringe when light of wavelength 656 nm falls on a double slit whose slit separation is 3.45 × 10-6 m?

11. ## Math

a park is 3/4 mile long and 1/2mile wide. Which fraction represents the ratio of the parks length to its width? I did it by 3/4 divided by 1/2 this equals 1 1/2 or 3/2 Is this correct?

12. ## Maths

How many integers satisfy the inequality ∣10(x+1)/(x^2+2x+3)∣≥1?

13. ## Math

the sum of 5 consecutive whole numbers is 2005. what is the sum of all the digits of these 5 numbers

14. ## chemistry

The triprotic acid H3A has ionization constants of Ka1 = 9.9× 10–2, Ka2 = 2.7× 10–8, and Ka3 = 5.9× 10–11. a). Calculate the following values for a 0.0570 M solution of NaH2A H+ ?? [H2A^-/H3A]?? b). Calculate the following values for a 0.0570 M

15. ## Chemistry

How do you distinguish between fluorene and acetanilide? Suggest methods other than melting point and chromatography.

16. ## Public speaking

Public speaking has been formally studied since: A. the 5th century. B. the 20th century. C. recently. D. communication courses were offered at universities. is it B 2. Early study of public speaking was known as: A. public communication. B. rhetoric. C.

17. ## Public speaking

In a world of ____________, communication skills help us to interact with people whose backgrounds are different from our own. A. careers B. changes C. technology D. personal relationships A is the only option tat makes sense to me but i'm not sure if its

18. ## chemistry

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.11. To do this, you choose to use mix the two salt forms involved in the second

19. ## Statisitics

In a large section of a Chemistry class, the points for the final exam are normally distributed, with a mean of 72, and a variance of 81. Grades are to be assigned according to the following rule: the top 10% receive As, the next 20% receive Bs, the middle

20. ## Simple Calculus

Evaluate \displaystyle \lim_{x \to 0} \frac{\sqrt{2}x}{\sqrt{2+x}-\sqrt{2}}.

21. ## govenment

The government set up by the Articles of Confederation had a. no legislative or judicial branch. b. only a legislative and an executive branch. c. only a legislative branch, consisting of a unicameral Congress. d. only a legislative branch, consisting of a

22. ## math

The Thompson Company uses standard costing and has established the following direct material and direct labor standards for each unit of Lept. Direct materials: 2 gallons at $4 per gallon Direct labor: 0.5 hours at$8 per hour During September, the company

23. ## Algebra

Suppose you buy flour and cornmeal in bulk to make flour tortillas and corn tortillas flour costs 1.50lb cornmeal costs 2.50lb you want to spend less than 9.50 on flour and cornmeal and you need at least 4lb altogether a) write a system of inequalities

24. ## statistics

The standard deviation of the diameter of 18 baseballs was 0.29cm. Find the 95% confidence interval of the true standard deviation of the diameters of the baseballs. Do you think the manufacturing process should be checked for inconsistency?

25. ## Finite Math

The reading list for a literature class has 6 fiction and 8 nonfiction books. A student is to write a report on 5 books from the list during the semester. The report must include at least 1 and at most 4 reports of fiction books. In how many ways can the

26. ## Algebra

An air plane can travel 560 miles per hour with the wind and 480 miles per hour against the wind. Determine the speed of the plane in still air and the speed of the wind.

27. ## chemistry

Phosphoric acid is a triprotic acid with the following pKa values: pKa1=2.148 pKa2=7.198 pKa3=12.375 You wish to prepare 1.000 L of a 0.0200 M phosphate buffer at pH 7.11. To do this, you choose to use mix the two salt forms involved in the second

28. ## Management

The bulbs manufactured by a company gave a mean life of 3000 hours with standard deviation of 400 hours. If a bulb is selected at random, what is the probability it will have a mean life less than 2000 hours? Question: 1) Calculate the probability. 2) In

1. A person's belief that he or she needs a drug to feel good or function normally (1 point) addiction psychological dependence emphysema tolerance 2. A large, dome-shaped muscle below the lungs (1 point) trachea alveoli diaphragm emphysema 3. Smoke that

30. ## math

A supply company sells packs of paper by the box. Each box contains the same number of packs of paper, P. Which equation could be used to find the total number of packs of paper, T, that would be in B boxes ordered?

31. ## math

The population mean length of a hospital stay for surgery is 5.5 days and the standard deviation is 1.9 days. What percentage of patients are hospitalized for 3.9 days or less? I've read the book and looked at the explanation that it gives and it's not

Write the equation for the depreciation of the value of your car for t years at 14% per year.

Solve for x? 0 = -9/5 x -9

34. ## calculus

determine the point of intersection of the tangents at the points of inflection to the curve f(x)= x^4 – 24x^2 – 2

how do i convert milligrams to grams- i am in fifth grade-easiest way please.

36. ## physics

Consider a concave mirror with radius R. An upright object is placed in between the interval R/2 and R. R

37. ## Math

Let log 2 = a, log 3 = b and log 7 = c. Express the indicated logarithm in terms of a, b, and c. 1-log3 5 (3 is the subscript of the log) ans:(1-a)/b, i need someone to show me the step bcus my ans is different from the given ans. my ans=(1/a)-b.

38. ## physics

if a cyclist takes one minute to comple half revolution on a circular path 120 m radius.what is the average velocity?

39. ## Math

if 4/3 x 3/4 =5k whats k

40. ## Algebra help!

1.) Solve the system by triangularizing the augmented matrix and using back substitution. -x-y+z=1 x-y-4z=-7 4x+y+z=6 2.) Perform the indicated row operation, then write the new matrix. -4 4 | 4 9 -6 | 5 -2R1+ R2 ---> R2 3.) Solve the system by

41. ## math

a lab assistant wants to make 5 liters of 27.8% acid solutions. if solutions of 50% and 13% are in stock, how many liters of each must be mixed to prepare the solution?

42. ## govenment

Virginia ratified the constitution with the help of all of the following men EXCEPT: a. Washington c. Henry b. Jefferson d. Madison

43. ## public speaking

public speaking has been formally studied since

44. ## chemistry

Pure water has a density of 1.00 g/ml at 297 . Calculate the molar concentration of pure water at this temperature. Would i just convert grams to moles, and ml to liters?

45. ## Math

the larger of the two numbers is 8 more than twice the smaller. The sum of the numbers is 10 less than three time the larger. Find the numbers

46. ## math

The total weekly cost (in dollars) incurred by Lincoln Records in pressing x compact discs is given by the following function. C(x) = 2000 + 2x - 0.0001x2 (0x 6000) (a) What is the actual cost incurred in producing the 1041st and the 2141st disc? (Round

47. ## Algebra

Two cars start at the same point at Alexandria, verginia, and travel 2 opposite directions. One car travels 5 miles per hour faster than the other car. After 4 hours, the two cars are 420 miles apart. Find the speed of each car.

48. ## English

Red Scarf Girl - I need a 3-4 sentence summary, central idea, and a quote from the book that would support the central idea.

49. ## fuuast

young, innovative, or high-tech firms often adopt the strategy of ignoring history or attempting to do something radically new.in what ways will this strategy help them? in what ways this strategy hinder them?

50. ## physics

A 62.0 skier is moving at 6.10 on a frictionless, horizontal snow-covered plateau when she encounters a rough patch 3.30 long. The coefficient of kinetic friction between this patch and her skis is 0.330. After crossing the rough patch and returning to

51. ## pre calculus

Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2-12x-4x+36=0 How on earth do I do this?

52. ## physics

A girl on a merry-go-round platform holds a pendulum in her hand. The pendulum is 3.7 m from the rotation axis of the platform. The rotational speed of the platform is 0.025 rev/s. It is found that the pendulum hangs at an angle è to the vertical. Find

53. ## government?

Which feature did the State constitutions and the Articles of Confederation have in common? a. royal governors b. bill of rights c. principle of popular sovereignty d. a strong executive elected by popular vote

54. ## Estimation and Computation

The ratio of boys to girls in a class is 2:3. If a student is chosen at random to be on the student council, what is the probability it will be a girl?

56. ## Statistics

A hospital claims that the mean waiting time at its emergency room is 25 minutes. A random sample of 16 patients produced a mean wait time of 27.5 minutes with a standard deviation of 4.8 minutes. Use the 1% level of significance to test is the wait time

57. ## physics

body floats 1/3 of volume outside the water and 3/4 of its volume outside another liquid.what is the density of ether liquid?

58. ## algebra 1

write an algebraic expression that could be used to represent the perimeter of the triangle below. write the expression in simplest form. triangle 3x+1 3-x 2x+4 A: 6x+2 B: 5x-8 C: 4x+8 D: 6x-2

59. ## Grammar (Ms. Sue)

I apologize for asking the same question, but I misunderstood the directions. The following sentences are written in the present tense. Rewrite each sentence in each of the other five tenses. 1). I collect. 2). You split. 3). They teach. 4). We give. 5).

60. ## physics

A horizontal spring with k = 45 N/m is attaches a 1.0kg block to a spring hung from the ceiling. A block is pulled down to a spot that is 30.0cm from the spring's rest position. What is it's new acceleration?

61. ## math

Find the average cost function C associated with the following total cost function C. C(x) = 0.000007x3 - 0.06x2 + 110x + 76000 C(x) = ?? (a) What is the marginal average cost function C' ? C'(x) = ?? (b) Compute the following values. (Round your answers

62. ## physics

What are the first, second, and third frequencies audible from a 20 cm long organ pipe when (A) only one end is open and when (B) both ends are open. The speed of sound through the air inside the organ pipe is 343m/s. (Hint: if a harmonic does not exist,

63. ## Trig

Use a half-angle identity to find the exact value for sec(x/2) if sinx = -12/13 ; 3pi/2 < x < 2pi

64. ## algebra

The following polynomial is prime. 2q² + 9q + 1

65. ## govenment

When crafting the new Constitution, the Framers drew from their experiences with which of the following? a. the governments of ancient Greece and Rome b. the writings of Rousseau and Locke c. their own State governments d. all of the above

66. ## Algebra

Graph the function. Compare the graph with the graph y= x² 1. y=x²+5

67. ## math

The ocean covers about 71% of the Earth’s surface. If the total surface area of the Earth is about 510 million square kilometers, how many square kilometers are covered by the ocean?

68. ## queen of peace academy

If 1g of sodium-24 has decayed from a sample that was orinally 2g. How old is the sample?

69. ## social studies

did Millard Fillmore want woman rights ?

70. ## Trig

Simplify (sin^2)*(67.5deg) - (cos^2)*(67.5deg) and then evaluate exactly.

71. ## physics

A bridge is supported at both ends (500m between supports). A Car (250 Kg) is at 100m from the left support. A truck (4000 Kg) is at 200m from the left support. Find the forces on the supports

72. ## Statistics

Weights of male mountain lions follow the normal distribution with a median of 150 lb and an interquartile range of 8.2 lb. Find the 75th percentile of the weights. Find the 95th percentile of the weights.

100. ## math

The pie chart shown in Figure A-6 illustrates the favorite foods of a selected group of fiveyear- old children. A total of 5,280 children were polled in order to construct this chart. According to the information provided in the chart, how many children

Siberian tigers originated in the far northern continent of Asia. The climate is extremely cold, since much of the land is within the Artic Circle. They were forced south over time and now reside in Southeast Asia, such as India, Thailand and Cambodia.

102. ## Math

All numbers in our real number system are the product of prime numbers. Complete the following steps for this discussion: 1. List the ages of two people in your life, one older than you and one younger than you. It would be best if the younger person was

103. ## statistics

Undergraduates in a large university class were asked to record the time they spent on the most recent homework. In a histogram of the recorded times, the height of the bar over the interval “1 hour to 3 hours” is 4% per hour. The height of the bar

104. ## statistics

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. (a)One of the

105. ## math

mary jogged 5 7/10 miles on monday and 4 1/8 miles on tuesday. Raul jogged 6 1/2 miles on monday and 3 4/5 miles on tuesday. How much farther did raul jog on monday than tuesday.

106. ## Algebra Multiple choice revised!! HELP

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give

107. ## science

1. For the three cubes shown below, determine their surface area, volume and surface area to volume ratio. Then, circle the one you believe would be the most efficient and write a summary stating why.

108. ## Algebra

Mr. and Mrs. Abdullah invest a total of $10,000 in two savings accounts. One account pays 5% interest and the other 6%. Find the amount placed in each account if the accounts receive a total of$540 in interest after one year.

109. ## Management

The price P per unit at which a company can sell all that it produces is given by the, function P(x) = 300 — 4x. The cost function is c(x) = 500 + 28x where x is the number, of units produced. Find x so that the profit is maximum., Question:, 1) Find the

110. ## Algebra

Two cars start at the same point at Alexandria, verginia, and travel Ans 50mph, 55mph 2 opposite directions. One car travels 5 miles per hour faster than the other car. After 4 hours, the two cars are 420 miles apart. Find the speed of each car.

111. ## physics help

The upper surface of a cube of gelatin, 6.9 cm on a side, is displaced 0.67 cm by a tangential force. If the shear modulus of the gelatin is 946 Pa, what is the magnitude of the tangential force?

112. ## Math

the perimeter of a rectangular field is 140m. If the length is increased by 15m and breadth is decrease by 5m, the length will become 3 times the breadth. Find the length of breadth of the field.

113. ## PHYSICS!!!!

An 80 kg man is riding in an elevator from the first floor to the 34th floor. The elevator and man are moving at a constant speed. What is the net force on the man in Newtons.

114. ## ALGEBRA(Sum of Absolute Value Differences)

As x ranges over all real values, what is the minimum value of f(x)=x−123+x−456+x−789?

115. ## programming

Create the logic for a program that prompts a user for three numbers and stores them in an array. Pass the array to a method that reverses the order of the numbers. Display the reversed numbers in the main program.

116. ## Algebra

The floor of a shed has an area of 54 sq.feet. Find the length and width if the length is 3 feet less than twice its width.

117. ## Geometry

A right triangular prism has volume equal to 288 cm^3 . The height of the prism is 3 cm. One of the bases of the triangular face (not the hypotenuse) is equal to 12 cm, determine the length of the hypotenuse (in cm) of the triangular face.

118. ## math8

there are two box and whisker plots class a: median=83 maximum #=100 minimun#=70 upper quartile=85 lower quartile=80 class b: median=80 maximum= 100 minimum=60 upper=90 lower=70 what describes the results? the medians for the two classes are the same. (i

119. ## math

need to know how to find the distrbutive property of 50x62,159= (50x )+(50x )+(50x100)+(50x50)+(50x9)

120. ## Algebra multiple choice!

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give

121. ## philosophy

I am to write a two page dialogue between Socrates and a person. I was thinking about writing about domestic violence. What do you think about that subject. Should I use statistics and numbers regarding this issue.

122. ## Lang. Arts

"Great works are performed, not by strength, but by perseverance.” The quote from Samuel Johnson at the beginning of the story suggests that the story will be about A.the roles people perform in life. B.making adjustments to goals. C.developing stronger

123. ## Grammar (Ms. Sue)

Is this correct way to write the word "borrow" in present progressive tense? "Today, the average American is borrowing more money than ever before."

124. ## Algebra Multiple choice!!! Help

1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.) –8R1 +R2 -> =R2 d.) 8R1-R2 -> =R2 2.) Solve the system by triangularizing the

125. ## dividing fractions

What is 4/9 divided by 1 1/2

126. ## Chemistry

How many mL of 12M HCl is needed to create 350mL of 0.125M HCl?

127. ## Probality

in a case in riverhead, New York, nine different crime victims listened to voice recordings of five diffent men. All nine victims identified the same voice as that of the criminal. If the voice identified were made by random guesses, find the probality

128. ## chemistry

How many milliliters of 0.602M hydrochloric acid (HCl(aq)) must be added to 15.00mL of 0.538M sodium hydroxide (NaOH(aq)) to reach the equivalence point? Report your answer to 2 decimal places.

129. ## Spanish

I tried on 8 but i didn't get 9. I do not know how to do these, so please help. Thank You. 8. Which of these sentences is correct? Juego baloncesto. Juego a la baloncesto. *Juego al baloncesto. 9. Which of these sentences is correct? Juego al golf. Juego

130. ## physics

a 125 cm long string has a mass 2.0g and it is stretched with a tension of 7.0 IN between fixed support

131. ## Stats

The scatter diagram of the lengths and widths of the petals of a type of flower is football shaped; the correlation is 0.8. The average petal length is 3.1 cm and the SD is 0.25 cm. The average petal width is 1.8 cm and the SD is 0.2 cm. 1. One of the

132. ## english

Which of these are epics? A.Gilgamesh B.Beowulf C.The Odyssey D.All of the above E.I'm not sure.

133. ## physics

A 92-kg man's thighbone has a relaxed length of 0.56 m, a cross-sectional area of 6.0 10-4 m2, and a Young's modulus of 1.2 1010 N/m2. By how much does the thighbone compress when the man is standing on both feet? 1 µm

134. ## chemistry

A certain weak base has a Kb of 8.40 × 10-7. What concentration of this base will produce a pH of 10.34?

135. ## physics

An apple (m = 125g) is attached to a vertical spring (from a ceiling) that has a k value of 55 N/m. The apple is held up so the spring is un-stretched. When the apple is released, a) how far will the spring stretch? b) How fast will it be going when it has

136. ## government

how did the watergate scandal gain attention? and why was an investigation launched?

137. ## Product of Roots of Sums of Products of Difference

What is the product of all roots to the equation ++(x−1)(x−2)(x−3)+(x−2)(x−3)(x−4)(x−3)(x−4)(x−5)+(x−4)(x−5)(x−6)(x−5)(x−6)(x−7)+(x−6)(x−7)(x−8)=0?

138. ## math

the diamond taxi company charges an initial fee of $3.00 plus$2.00 per mile for each ride. a) using the table show the cost (C) of taking a taxi 0-5 miles number of miles cost(c) 1 ? 2 ? 3 ? 4 ? 5 ? can you show me to do the number of miles for 1 and then

139. ## Maths

Let f be the function defined as f(x)=x2 in the domain [−7,+7]. The range of f(x) is [a,b]. What is the value of a+b?

140. ## Math

What is 9/20 in simplest form?

141. ## Statistics

An orchestra consists of 25 members. The youngest member is 32 years old. She leaves and is replaced by a new member who is 30 years old. By how much does the replacement change the average age of the members of the orchestra? By how much does the

142. ## concepts to population health

Why is it important to use rates for comparison of health and disease among subpopulations?

182. ## Life orientation

Community organizations that are involved in supporting HIV