# Questions Asked onAugust 12, 2015

1. ## Polygon

Find to the nearest degree, the size of each angle of regular heptagon

2. ## Chemistry

Explain how you would obtain solid sodium carbonate from a mixture of lead carbonate and sodium carbonate powder

3. ## Chemistry

I'm working on a problem that says: A 4.00 gram sample of a mixture of CaO and BaO is placed in a 1.00 L vessel containing Co2 at a pressure of 730 torr and a temperature of 25C. The CO2 reacts with the CaO and BaO forming CaCO3 and BaCO3. When the

4. ## algebra

Given the exponential function A(x) = P(1 + r)x, what value for r will make the function a decay function?

5. ## physics

A car (m = 1870 kg) is parked on a road that rises 12.1 ° above the horizontal. What are the magnitudes of (a) the normal force and (b) the static frictional force that the ground exerts on the tires?

6. ## Calculus

The balloon leaves the ground 80 ft. from an observer and rises vertically upward at 5 ft/s. (a) How fast is the balloon receding from the observer after 12 seconds? (b) find the corresponding acceleration? How do I sketch it? and what equation should I

7. ## afrikaans (AFK503/101)

Hi there, can anyone pls help me with AFK1503/101 - 2015. I am seeking an English version of this assignment pls, is there an English one available? if there is pls provide me with a website address to get access. Thank you. Tanya

8. ## Geometry

Given the rectangle ABCD has a total area of 72. E is in the midpoint of BC and F is the midpoint of DC. What is the area of the inscribed triangle AEF?

9. ## Calculus

A man 5.5 ft tall walks away from a lamp post 10 ft high at the rate of 8 ft/s. (a) How fast does his shadow lengthen? (b) How fast does the tip of the shadow move? Can you please tell me what method/s you used to come up with a solution? I wasn't sure

10. ## Counting and Probability

How many 3-digit numbers have the units digit larger than the tens digit?

11. ## math

The difference between two numbers is 4 and their sum is -7. What is their product?

12. ## Maths progression

In an AP whose first term is 2,the sum of first five term is one fourth the sum of the next five terms.show that T20=-112. Find S20.

13. ## Math

If (x - 2)^2 = 49, then x could be (A) -9 (B) -7 (C) 2 (D) 5 (E) 9 (x - 2)^2 = 49 (x - 2) (x - 2) = 49 x^2 - 2x - 2x + 4 = 49 x^2 - 4x + 4 - 4 = 49 - 4 x^2 - 4x = 45 I am not sure what to do from here.

14. ## math

And armored truck left a federal bank at noon when a shipping error was discovered an agent was sent by helicopter to overtake the truck the helicopter left at 1:48 PM and flew at an average speed of 170 km/h. If the truck was overtaken at 3:24 PM what was

15. ## Chemistry

How many moles of acetic acid are present in 10.00 mL if the concentration is 0.500M HC2H3O2?

16. ## Urgent math

Which of following is divisible by 4 for all natural numbers n? (Select all that apply.) please help ?!?!? 5n + 1 − 9 6n − 2 7n + 1 3n + 1 10n − 2

17. ## Urgent math

Please help me solve this problem?!?! Find the first six terms and the sixth partial sum of the sequence whose nth term is an = 5n2 − n. a1 = a2 = a3 = a4 = a5 = a6 = S6 =

18. ## physics

A bird watcher meanders through the woods, walking 0.544 km due east, 0.925 km due south, and 3.58 km in a direction 17.3 ° north of west. The time required for this trip is 1.957 h. Determine the magnitudes of the bird watcher's (a) displacement and (b)

19. ## calculus

You are given that f(x) =1+ax+ax2 f′(x) =−(x+2)ax3 f′′(x) =(2x+6)ax4 and the constant a>0. Write down all intervals on which the function is increasing, decreasing, concave up or concave down. (Enter using notation (a, b). Use a comma to separate

20. ## calculus

A person is jumping straight up and down on a trampoline. The height of the center of mass of the person is measured every tenth of a second. It takes just over one second to complete one full bounce. (If you want to see the data, look at the video above.)

21. ## Language arts help

"It had been days since he has seen the sun,and he knew that a few more days must pass before that cheerful "orb", due south,would just peep above the skyline and dip immediately from view." Which of the following context clues helps to explain the meaning

22. ## Economics

If switching to fast replenishment compared to holding inventory in a dc (distribution center). Is this: Operational? Tactical? or Strategic?

23. ## physics

A bus accelerates at 2.4 m/s2 from rest for 10 s. It then travels at constant speed for 25 s, after which it slows to a stop with an acceleration of magnitude 1.5 m/s2. (a) What is the total distance that the bus travels? (b) What was its average velocity?

24. ## Algebra 2

Which of the following equations represents the line that is parallel to the line y=5x+2 and that passes through the point (1,-3)?

25. ## alegebra

the first third and ninth term of a linear sequence are the first three terms of an exponential sequence.if the 7th term of the linear sequence is 14 calcuate the 20th term of the linear sequnce

26. ## Algebra

In a science competition with ten problems, a student gets 5 points for a correct answer and loses 2 points for an incorrect answer. If Alice answered every problem and her score was 29, how many correct answers did she have? i'm thinking you have to set

27. ## Math

For every \$4 Halle saves her brother saves \$7 determine. Ratio

28. ## Math

How do you find an eighth of an inch on a ruler ?

29. ## Sophia

The following formula relates the distance S (in feet) traveled by a vehicle during an emergency stop to the time T (in seconds) it takes to arrive at a complete stop: s(t)=16t^{2} At the scene of an accident, Bill uses skid marks to determine the braking

30. ## math

Planets A, B and C orbit a certain star once every 3, 7, and 18 months respectively. If the three planets are now in the same straight line, what is the smallest number of months that must pass before they line up again?

31. ## Physics

An atom is ionized so that it has only one electron. When the electron drops from the n = 6 shell to the n = 1 shell, an X-ray of wavelength 193.76 pm is emitted. What is the atomic number?

32. ## Accounting

In the context of determining fair value, the exit price refers to: A. The amount the firm would receive if it sold a given asset. B. Amount the firm would pay if it bought an asset of the same type and condition as the one being valued. C. Sum of the

33. ## Physics

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway? I'm not sure how to set up the problem.

34. ## Physics

A small aircraft requires a speed of 34.0 m/s in order to take off. What minimum constant acceleration does this require if the aircraft is to be airborne at the end of a 245. meter long runway? I'm not sure how to set up the problem.

35. ## private

hey ms. sue is there are private email i can contact you regarding help that i need without using I alot thankls.

36. ## Math

Convert 240sec= min. Is this correct I got 4 min

37. ## Math (Calculus)

Hello, Could somebody please help me with the following question? It asks to differentiate the function below according to derivate rules of calculus such as the power rule (if f(x)=x^n, then f'(x)=nx^n-1), the product rule (if F(x)=f(x)g(x) then

38. ## Physics

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 76.7 m/s2 for 1.89 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude

39. ## Math

In a science competition with ten problems, a student gets 5 points for a correct answer and loses 2 points for an incorrect answer. If Alice answered every problem and her score was 29, how many correct answers did she have?

40. ## Calculus

Posted by hey on Monday, August 10, 2015 at 11:28pm. A man 5.5 ft tall walks away from a lamp post 10 ft high at the rate of 8 ft/s. (a.) How fast does his shadow lengthen? (b.) how fast does the tip of the shadow move? Calculus - Reiny, Monday, August 10,

41. ## Algebra

I need help step by step please I keep getting a wrong answer of 252? Find the 24th term in the expansion of (a + b)^ 25

42. ## Algebra

Can anybody help me on this problem for my Algebra 2 class, I am having a hard time tyring to solve it step by step. The probability that an archer hits the target is p = 0.8, so the probability that he misses the target is q = 0.2. It is known that in

43. ## Physics

helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 108-kg laser sensor which measures the thickness of the ice (see the drawing). The helicopter and the sensor move only in the horizontal direction and have a horizontal

44. ## Physics

On August 12, 1987, Alessandro Andrei set a world record in the shot put with a throw of 22.9m. What was the initial speed of the shot if he released it at a height of 2.10m and threw it at an angle of 38 degrees above the horizontal?

45. ## physics

A model rocket blasts off from the ground, rising straight upward with a constant acceleration that has a magnitude of 87.9 m/s2 for 1.51 seconds, at which point its fuel abruptly runs out. Air resistance has no effect on its flight. What maximum altitude

46. ## physics

A 10 μC charge of mass 20 g, initially at rest at x = - 1 m in a constant electric field E = 2000 V/m is released from rest. What is its speed at x = 5 m?

47. ## physics

Two point charges q1 = q2 = 2μC are fixed at x1 = + 3 and x2 = – 3. A third particle of mass 1 g and charge q3 = – 4 μC are released from rest at y = 4.0. Find the speed of the particle as it reaches the origin. q1= q q2= -q x θ

48. ## physics

A 72.2-kg person stands on a scale in an elevator. What is the apparent weight when the elevator is (a) accelerating upward with an acceleration of 1.53 m/s2, (b) moving upward at a constant speed, and (c) accelerating downward with an acceleration of 1.44

49. ## physics

A 15.5-kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 76.7 N and is directed at an angle of 27 ° above the horizontal. Determine the coefficient of kinetic friction.

50. ## physics

The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces, and , on this tooth in order to bring it back into alignment. If the forces have the same magnitude of

51. ## physics

The person in the drawing is standing on crutches. Assume that the force exerted on each crutch by the ground is directed along the crutch, as the force vectors in the drawing indicate. If the coefficient of static friction between a crutch and the ground

52. ## math

A car moving with a velocity of 20m/s at 30 degree to the horizontal,what is the component of the velocity along the horizontal?

53. ## math or algebra

I have two questions The temperature changed from 7ºF at 6 P.M. to -5ºF at midnight. What was the difference between the high and low temperatures? What was the average change in temperature per hour? The difference between the temperatures is 12 because

54. ## Chemistry

Starting with copper metal, describe how a sample crystals of copper 2 chloride may be prepared in the labaratory

55. ## english

Are the words wear, lay, worn, black, passing, wood, and step connotative words ? Thanks

56. ## math

I have two questions: The temperature changed from 7ºF at 6 P.M. to -5ºF at midnight. What was the difference between the high and low temperatures? What was the average change in temperature per hour? The difference between the temperatures is 12ºF

57. ## Math

The average (arithmetic means) of t and y is 15, and the average of w and x 15. What is the average of t, w, x, and y? (A) 7.5 (B) 15 (C) 22.5 (D) 30 (E) 60

58. ## Math

a piece of wire is 20 cm. long. it is cut into pieces, each of which is then bent to form a square. the total area of the two squares is 13 sq. cm. How long is side of each square?

59. ## math

A square piece of cardboard is to be used to form a box without a top by cutting off squares, 5cm on a side, from each corner and then folding up the sides. if the volume of the box must be 320 sq. sm, what must be the length of a side of the cardboard?

60. ## calculus

F.(0) (10 puntos posibles) C1 What is limh→0cos(π6+h)−cos(π6)h? (Enter the answer as a decimal. If the limit does not exist, enter DNE.) sin responder Loading C2 At which of the five points on the graph are dydx and d2ydx2 both negative? Click all

61. ## science

C respectively to prepare a 50% (mass by volume) solution of sodium hydroxide (NaOH). 'A' dissolved 50 g of NaOH in 100 ml of water B dissolved 50g of NaOH in 100g of water while C dissolved 50g of NaOH in water to make 100ml of ...

62. ## calculus

Find the tangent line to the curve xy3+2y−2x=1 through the point (x,y)=(1,1). (Enter ∗ for multiplication: type 2*x for 2x. Enter / for division: type 1/2 for 12.) Tangent Line y=

63. ## calculus

Draw the graph of the function (qualitatively accurate). y=x+1−−−−−√/(x−b),1

64. ## calculus

Evaluate these limits. (Enter answer as a decimal. Enter INF if the limit is +∞; -INF if the limit is −∞; and DNE if the limit is neither ±∞ and does not exist.) (a) limx→04+x−−−−−√−2x= - sin responder (b) limx→0tan(2x)sec(3x)x

65. ## calculus

F. (7) (2 puntos posibles) Let f(x)={tanxax+bπ/4

66. ## calculus

(a) Give the linear approximation for the function e−x1+x near x=0. (Enter ∗ for multiplication: type 2*x for 2x. Enter / for division: type 1/2 for 12.) - sin responder (b) Give the quadratic approximation for the function ln(cosx) near x=0. (Enter

67. ## calculus

F. (11) (2 puntos posibles) Consider a circular cone with base of radius a and a height of a. Find the vertical cylinder of largest volume inside this cone. In terms of a, what is the radius of this largest cylinder? (Enter ∗ for multiplication: type 2*x

68. ## calculus

F. (12) (1 punto posible) You are at a point x=x(t) along a horizontal line, representing the ground. You are flying a kite which maintains a constant height of 40 meters. Assume also that the kite string is a straight line. The kite is above the point

69. ## calculus

This problem requires a calculator. Enter answers as decimals. Grass clippings are placed in a bin, where they decompose. The amount of grass clippings measured in kilograms is modeled by A(t)=7.0(0.95)t, where t is measured in days. (a) Find the average

70. ## life orientation

Assess the extent to which bad road use has a direct impact on the physical,emotional,social and economic aspects to the family,the community and the country

71. ## probability

Please help me solve this problem step by step pleaseeee! The probability that an archer hits the target is p= 0.8, so the probability that he misses the target is q = 0.2. It is known that in this situation the probability that the archer hits the target

72. ## pre-cal

Use Pascal's triangle to expand the expression. (x − y)5 so I tried to work this out: (x-y)^5 = [(x-y)(x-y)][(x-y)(x-y)](x-y) (x-y)^2 = (x-y)(x-y) = x^2 - 2xy + y^2 x^2 - 2xy + y^2)(x^2 - 2xy + y^2) = x^4 -4x^3y + 6x^2y^2 - 4xy^3 + y^4 I am still

73. ## science

what are the different daily observations in seed germination. What are the factors and its effect on germination? Data Chart: Cup #1 Seeds with water and sunlight Cup #2 Seeds with water and no sunlight Cup #3 Seeds with sunlight and no water OBSERVATION

74. ## Math

If j / k = 32 and k = 3 / 2, what is the value of 1 / 2 j?

75. ## chemistry

how much grams of cao is produced by oxidation of 1gm of calcium

76. ## chemistry

132gram o2 is required for a combustion of 28 liter mixture of ethane and ethene (at NTP) than find out mole fraction of ethane and ethene in the mixture?

77. ## Finance

Suppose your bank account will be worth \$15,000.00 in one year. The interest rate (discount rate) that the bank pays is 7%. What is the present value of your bank account today? What would the present value of the account be if the discount rate is only

78. ## Finance

Suppose you have two bank accounts, one called Account A and another Account B. Account A will be worth \$6,500.00 in one year. Account B will be worth \$12,600.00 in two years. Both accounts earn 6% interest. What is the present value of each of these

79. ## finance

. Suppose you just inherited an gold mine. This gold mine is believed to have three years worth of gold deposit. Here is how much income this gold mine is projected to bring you each year for the next three years: Year 1: \$49,000,000 Year 2: \$61,000,000

80. ## Socials

I am coming up with a sample debate topic outline(not too elaborate) for class- and it must be on a current, global issue. I am thinking on addressing the currency fluctuations, but I don't really understand how any of it works, the current situation, or

81. ## Math

Twice the sum of the digits of a positive, two-digit integer is 19 greater than the ones digit. Reversing the digits decreases the number by 18.

82. ## Chemistry

Can someone explain to me what an intermediate product is and give me and example?

83. ## math

prove that sin^6a+sin^4acos ^2a-sin^ 2acos^4a=1-2cos^2a

84. ## Physical Science- Atomic Structure

An electron jumps from energy level 1 to energy level 2 by absorbing a photon of energy 8 eV. What is the most likely energy of the photon that will be emitted by the electron when it moves back down to energy level 1? 2 eV 4 eV 8 eV 12 eV

85. ## History

I need help finding the answers! 1. Which of the following key terms has been responsible for the formation of many limestone caves in northern Georgia? (1 point)fault erosion plateau elevation 2. Which of the following regions is located in the

86. ## chemistry

Help !determine the emprical formula of a compound w which had 34.2 of iron and 65.8 of chlorine cl35.5 fe56

87. ## algebra 1

someone please help me. The function f(x) is shown below: f(x) = (5)x - 1 The function f(x) is shifted to the right by 13 units. Which of the following best represents the new function? f(x) = (5)x + 13 f(x) = (5)x + 12 f(x) = (5)x - 14 f(x) = (5)x - 13

88. ## pre-cal

please help, step by step having difficulty here as well. Find the term containing x5 in the expansion of (x + 2y)^10

89. ## statistics

Consider the events of drawing an ace, then draw another ace, followed by a queen, one at a time without replacement (from a standard deck of cards). What is the probability of drawing an ace, then another ace, then a queen? please show explanation

90. ## Algebra ASAP

so this is a fill in on a worksheet and I am having difficulty as the ones I inserted are incorrect can anybody help me how to do it all, sorry it's a long problem. Show that 3^2n − 1 is divisible by 8 for all natural numbers n. Let P(n) denote the

91. ## life orientation

assess the extent to which bad road use has a direct impact on the physical, emotional, social and economic aspects to the family, the community and the country.