# Questions Asked onMay 3, 2015

1. ## Chemistry(difficult)

A moon rock collected by a U.S. Apollo mission is estimated to be 3.70 billion years old by uranium/lead dating. Assuming that the rock did not contain any lead when it was formed, what is the current mass of 206Pb per 1.185 g of 238U in the rock? The

2. ## math

A wall in Marcus's bedroom is 8 2/5 feet high and 18 1/3 feet long. If he paints 1/2 of the wall blue

3. ## Math

What is the next number in this series? 2 1 .5 .25 .125

4. ## Math

Thomas and Jonelle are playing darts in their garage using the board with the point values for each region shown below. The radius of the outside circle is 10 inches, and each of the other circles has a radius 2 inches smaller than the next larger circle.

A 35-mm camera equipped with a 40-mm focal length lens is used to photograph a tree 17 m tall. If a 32-mm high image of the tree on the CCD sensor is required, how far should the camera lens be from the tree? Show Work Please! Thank you so much!

39. ## physics

Bill has a mass of 66.9 kg. Jane has a mass of 58.8 kg. If they are seated 2.2 m apart, how much gravitational force attracts them?

40. ## Trigonometry

Find the exact value of the expression: tan−1(tan(−120651/47π)) I just don't know how to find the exact value. Any explanation would be awesome!

41. ## science

The mass of a beaker containing a sample of sodium dichromate was determined to be 68.9 g. After transferring a sample it weighed 56.424 g.Determine the mass (g) of sodium dichromate transferred to the correct number of decimal places

42. ## Chemisty

The aqueous solution of two soluble salts are mixed to precipitate an insoluble salt. Give four different equations to support this statement.

43. ## Math trigonometric Identities

Is this correct? (sinx - cosx)^2 = 1 - 2sinxcosx LS = sin^2x - 2sinxcosx + cos^2x = 1 - cos^2x - 2sinxcosx + cos^2x = 1 - cos^2x + cos^2x - 2sinxcosx = 1 - 2sinxcosx LS = RS

44. ## trigonometry

show that : sin(A+B).sin(A-B)=Cos^2B - Cos^2A =sin^2A - sin^2B

45. ## science

750N diver does a triple somersault off a 10m platform. If it takes 1.5sec. to hit the water. What is the diver's power?

46. ## Math

If tan A = a / b, a (is greater than sign) 0, b (is greater than sign) 0, and 0 is (less than sign) A (is less than sign) pi / 2, then what is cos A? a. a / b B. b / a C. a / radical(a^2 + b^2) D. b / radical(a^2 + b^2) E. radical(a^2 + b^2) / b

47. ## Lukhanyo

English is the language of opportunity. Why bother to teach indigenous languages

48. ## Math

You draw five cards from a standard deck of 52 cards. P(heart) = 4/5 (fraction). What type of probability is illustrated and why? Theoretical; the result is based on the number of possible outcomes** Theoretical; the result is found by repeating an

49. ## Physics

Prove that if an object is at a distance of twice the focal length from a lens the image is the same size as the object. Show this using an algabraic method.

50. ## physics

a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0 .2 and the push imparts an initial speed of 4m/s?

51. ## Math

The solution set of radical(x - 1) (is greater than sign) 5 is the set of all real numbers x such that: F. x (is greater than sign) 4 G. x (is greater than sign) 6 H. x (is greater than sign) 24 J. x (is greater than sign) 25 K. x (is greater than sign) 26

52. ## physics

a box is given a push so that it slides across the floor. how far will it go, given that the coefficient of kinetic friction is 0.2 and the push imparts an initial speed of 4m/s?

53. ## Earth Science

the magnification of a telescope is changed by changing what? my answer is the eyepiece

54. ## science

What is the major difference between how water and nutrients are carried in a plant and how water and nutrients are carried in the human body?

55. ## science

The blocks shown are released from rest with the spring unstretched. The pulley and the horizontal surface are frictionless. If k = 427.1 N/m and M = 4.5 kg, what is the maximum extension of the spring?

56. ## Statistics

The estimate of the population proportion is to be within plus or minus 0.06%, with a 99% level of confidence. The best estimate of the population proportion is 0.22. How large a sample is required? Round answer to the next whole number.

57. ## chemistry

how many grams of potassium carbonate are in 75.0ml of a 2.44M solution?

58. ## Math

Integral of (1/root over 1-x^2)*(1/inverse of sin x*dx) .what is the value?

59. ## Math HELPPP!

Andrew's dog Bubba has an exercise area behind the house. A stake in the ground has a 12 foot rope tied to it. The other end of the rope is fastened to Bubba's collar. If Bubba travels in a circular path around the stake. What is the largest Circumference

60. ## Math Trigonometric Identities

Is this correct? (sinx - cosx)^2 = 1 - 2sinxcosx LS = sin^2x - 2sinxcosx + cos^2x = 1 - cos^2x - 2sinxcosx + cos^2x = 1 - cos^2x + cos^2x - 2sinxcosx = 1 - 2sinxcosx LS = RS

61. ## math

what formular do you use to find the area of an angle PQR

63. ## Calculus max/min

d=0.767. There are two parallel sidewalks that are separated by the park that is 600 feet wide. You are standing on the south sidewalk facing east. On the north sidewalk, 2000 feet ahead of you, is a bus stop. You can walk on the sidewalk at 5.5+d feet per

65. ## math

stuck on this problem. i started with x-2y+4z=23. here is the problem: Three men, each having denarii, found a purse containing 23 denarii. The first man said to the second, “If I take this purse, I will have twice as much as you.” The second said to

66. ## physics

A cube has a density of 2200kg/m3 while at rest in the laboratory. What is the cube's density as measured by an experimenter in the laboratory as the cube moves through the laboratory at 81.0{\rm \\%} of the speed of light in a direction perpendicular to

67. ## Chemistry

How much heat is absorbed by a 2966 kg granite boulder as energy from the sun causes its temperature to change from 3°C to 31°C? 1000 g = 1 kg

68. ## Math

Evaluate the following expressions tan(−22/15π)

69. ## English

Why is it that Ray Bradbury wrote Fahrenheit 451 during the 1950s?

70. ## Sociology

I need help choosing an object to describe me for a sociology project.

71. ## education

The children’s performance in relation your main objective listed on the activity plan what is this question asking. example please

72. ## Chemistry

If you have a sample of gas with a volume of 15mL and it changes to 25mL , what would be the new pressure if the original pressure was 5.0 atm ?

73. ## Physics

Given an object distance of 48[mm] and a thin-lens focal length of 110[mm], then what is the image distance? What is the scale factor (M) of the image seen in the previous question?

74. ## History

What is the definition of strategy?

75. ## maths

solve the following systems of equation 5x+3y+z=-34 x-3y+2z=13 14x-2y+3z=-53

76. ## chemistry

A 0.239 mol sample of PCl5(g) is injected into an empty 2.85 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium.

77. ## english/polsci essay excerpt edit

Can someone edit this? Also, does anyone edit whole papers? (Essay redacted per request from original poster.)

78. ## trig

Find the values of sin 0, cos 0, and tan 0ƒáif the angle 0ƒáis in standard position and its terminal side passes through the point (¡V15, 8). Give answers as fractions.

79. ## Chemistry (Molarity)

Indicate the concentration of each ion or molecule present: a mixture of 48.0 mL of 0.11 M KClO3 and 28.0 mL of 0.29 M Na2SO4. Assume the volumes are additive. a) [K+] b) [ClO3-] c) [SO42-] d) [Na+] We haven't taken notes on this particular type of problem

80. ## trigonometry

Solve cos(x)=0.07 on 0≤x

81. ## Math-Probability

In 2008, 1.01% of returns were audited, 85.6% returns received a refund, 49,907 the number examined resulting in a refund, 1,342,674 number examined resulting in no refund. If a taxpayer receives a refund, what is the likelihood that the taxpayers return

82. ## Physics

Consider two students, a 65 kg guy and a 50 kg girl who are attracted to each other, gravitationally, that is. They sit next to each other in Physics class which means there is 1.5m between their centers. What is the magnitude of the force of gravity

83. ## Maths

Four non coplanar points are given. How many boxes have these points as vertices?

84. ## Math 222

How do I graph these two problems? y = −x2 g(x)= sqrt x-1

85. ## mth121

mth 121(solve the linear equation:2x+3y=3, x-2y=5 and 3x+2y=7.)

86. ## French

Can someone check my present tense story for me in French? as well as the past? (This is another simpler summarization cuz my other one was so complicated) but thx to whoever helped. 1.) Il y a un homme qui s'appelle Alexandre Lagarde. 2.) Il a un

87. ## Math

(sinx - cosx)(sinx + cosx) = 2sin^2x -1 I need some tips on trigonometric identities. Why shouldn't I just turn (sinx + cosx) into 1 and would it still have the same identity?

88. ## Criminal Justice

Which of the following would a rational choice theorist most likely consider to be a factor in crime causation? A. Poverty B. A poor home environment C. Inadequate socialization D. Individual choice is it D

89. ## Law and Ethics Medical

2. Elizabeth says duty of care is the obligation health care workers have toward patients. Randy says professional etiquette is the obligation health care workers have toward patients. Who is correct? A. Only Randy is correct. B. Neither is correct C. Only

90. ## Law and Ethics Medical

The verification requirement of HIPAA requires that PHI information not be disclosed without verifying A. the accuracy of medical information before it's released. B. the identity of the person making the request. C. that the information can't be obtained

91. ## Law and Ethics Medical

The verification requirement of HIPAA requires that PHI information not be disclosed without verifying A. the accuracy of medical information before it's released. B. the identity of the person making the request. C. that the information can't be obtained

92. ## setswana

kwelola mafoko a latelang mme o a buisitse kwa sekao: mala,sala,bala,sila,bin,lala,mens,bua,rua,kua,tima,kima,sia godimo dira ja o ga fitlha a buisa sentle

93. ## physics

vibrating a long spring with a succession of pulses with a frequency of 50Hz produces adjacent nodes that are separated by 3.5cm. what is the velocity of the longitudinal waves formed?

94. ## Criminal Justice

People appear to be particularly fascinated by what type of crime? A. Violent B. Property C. Victimless D. Common law Is it A

95. ## Law and Ethics Medical

Which of the following is true regarding birth certificates for nonhospital births? A. Birth certificates for nonhospital births are filed by the mother. B. Birth certificates for nonhospital births are optional but recommended. C. Birth certificates for

96. ## economics

Are there any current subsidy or welfare issues that are being addressed in parliament or in municipalities

98. ## English

Why marriege is an advantage for men not only for woman?

99. ## math

which function has the greater rate of change? x-axix: -1 | 0 | 1 | 2 | y-axis: 0 | 1 | 2 | 3 | the graph has a line and 3 dots on the line. the first dot is 0, -1 the second dot is 0, 1 the third dot is 1, 2 A. the rates of change are equal B. the graph

100. ## chemistry

As a research chimst, you are intrested in studying the extent and type of interactions in aqueous salt solution. As part of this study, you weight three samples of NaCl and dissolve each in 1.000kg H2O. You then measure the freezing temp. of each solution

101. ## Statistic

Researchers collected samples of water from streams in a mountain range to investigate the effects of acid rain. They measured the pH (acidity) of the water (a lower pH means the water is more acidic). They then classified the steams with respect to the

102. ## maths

simplify 8C5 The "C" stands for combinations ( like combinations and permutations )

Find the function that has the greater rate of change As x increases by 1, y increases by 3. The graph has a line and 3 dots. the dots are labeled- x: -1 | 0 | 1 y: 0 | 2 | 4 A. the slopes are equal B. the graph has a greater slope C. the function rule has

104. ## Law and Ethics Medical

Which of the following has the most potential to treat the widest variety of diseases? A. Adult bone marrow B. Stem cells in umbilical cord blood C. Amniotic stem cells D. Embryonic stem cells I have NO CLUE on what is the right choice

105. ## math

In printing an article of 21,000 words, a printer decides to use two sizes of type. Using the larger type, a printed page contains 1,200 works. Using the smaller type type, a page contains 1,500 words. The article is allotted 16 full pages in a magazine.

106. ## PHYSICS

When some stars use up their fuel, they undergo a catastrophic explosion called a supernova. This explosion blows much or all of a star's mass outward, in the form of a rapidly expanding spherical shell. As a simple model of the supernova process, assume

107. ## Law and Ethics Medical

Which of the following is true? A. All states require parental involvement for a minor to obtain birth control. B. No state requires parental involvement for a minor to obtain birth control. C. Some states require doctors to inform parents that a minor has

108. ## Math

Three individuals form a partnership and agree to divide the profits equally. X invests $4,500, Y invests$4,500, and Z invests $1,000. If the profits are$1,500, how much less does X receive than if the profits were divided in proportion to the amount

109. ## Science

Give an example of something that uses all third of Newton's Law.

110. ## Calc 1

A rectangular garden is to be enclosed by a fence and divided into 5 regions as shown below. Find the values of L and W for which the total area is as large as possible assuming that only 120 ft. of fencing is available.

113. ## Math

Pearland Medical Center owns a small satellite clinic, specializing in General Practice, located at nearby Pearland airport. General Practice Clinic’s sole payor is Air Health, a health care plan that covers the airport employee population. Air Health

114. ## Calculus 2

Find the radius of convergence and interval of convergence of the series. There is an infinity sign on top of the summation symbol and "n=1" underneath it. To the right of the summation symbol is x^n/5n! How would you find the radius of convergence and

115. ## Chemistry-Acids

Write a balanced chemical equation to show the reaction that occurs when each weak acid reacts with water. (Omit states-of-matter from your answer. Use the lowest possible whole number coefficients.) (b) HCHO2 I've gotten a and c correct, and from that I

116. ## Electrical trade theory N2

What are the functions of the brushes in a dc motor?

117. ## Science

How does the sun's gravitational attraction to the earth compare to that of the moon?

118. ## Science

On what sides does a "bulge" in the earth's oceans appear on the earth?

119. ## chemistry--last time i promise

CO(g) + H2O(g)-->CO2 + H2 (g) reaction occurs in a 2.0 Ll reactor at 800 degrees celsius. The reaction conditions are such that a complete conversion of reactants into products results. The reactor is charged initially with 5.0 atm of CO and 8.0 atm of

120. ## Math 222

Why is it so difficult to get help when someone has posted a question 8 hours ago???

121. ## Law and Ethics Medical

. Which of the following has the most potential to treat the widest variety of diseases? A. Adult bone marrow B. Stem cells in umbilical cord blood C. Amniotic stem cells D. Embryonic stem cells A?

122. ## Science

There are 2 high and 2 low tides each day. Why do this many tides occur each day?