1. Statistics

The amount of rainfall in January in a certain city is normally distributed with a mean of 4.2 inches and a standard deviation of 0.5 inches. Find the value of the quartile Q1

2. Math

Kevin has 18 unit cubes. How many different rectangular prisms can be built using all the cubes

3. Chemistry

A solution contains 0.022 M Ag and 0.033 M Pb2 . If you add Cl–, AgCl and PbCl2 will begin to precipitate. What is the concentration of Cl– required, in molarity, when A. AgCl precipitation begins? B. AgCl precipitation is 99.99% complete? C. PbCl2

4. physics 70

A .275 kg. object is swung in a vertical circular path on a string .850 m. long. A) What are the forces acting on the ball at any point along this path? B) Draw free-body diagrams for the ball when it is at the bottom of the circle and when it is at the

5. algebra 2

During the first part of a trip a canoeist travels 26 miles at a certain speed. The canoeist travels 8 miles on the second part of the trip at a speed 5 mph slower. Total time is 3 hours. What was the seed on each part of the trip

6. physics

Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.

7. algebra 2

what is the value of the rational expression below when x is equal to three? 17+x/x+2

8. physics

A different scaffold that weighs 400 N supports two painters, one 500 N and the other 400 N. The reading in the left scale is 800 N. What is the reading in the righth and scale?

9. Geometery

Composite figure finding area. Is this right my answer I came out with is 323.5 cm? Rectangle: A=22cm x 17cm = 374 (Long side is 22cm, Width is 17cm.) Triangle: A = 1/2 x b x h A = 1/2 x 19cm ( no height given) So then, I added the rectangle and trinagle

10. Chemistry

What [PB2+] should be maintained in Pb(NO3) to produce solubility of 1.0*10^-4 mol PbI2/L when PbI2 (s) is added? Ksp for PbI2 is 7.1*10^-9 I can't figure it out...

11. Chemistry

A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1

12. Physics

A pot of water is boiling under one atmosphere of pressure. Assume that heat enters the pot only through its bottom, which is copper and rests on a heating element. In two minutes, the mass of water boiled away is m = 2.5 kg. The radius of the pot bottom

13. physics

Two speakers are wired to emit identical sounds in unison. The wavelength in air of the sounds is 6 m. Do the sounds interfere constructively or destructively at a point 10 m from both speakers? 1. Destructively 2. Neither 3. Constructively

14. geometry

AB has a length of 5 cm the line segment is dilated to produce A'B' which has a length of 2 cm what is the scale factor of the dilation

15. Chemistry

Write an equation that represents how dihydrogen phosphate ion (H2PO4-) behaves as an Arrhenius acid. ( Be sure to include the correct charges for ions.)

16. Calculus

A University of Rochester student decided to depart from Earth after his graduation to find work on Mars. Before building a shuttle, he conducted careful calculations. A model for the velocity of the shuttle, from liftoff at t = 0 s until the solid rocket

17. Chemistry

Write an equation showing that calcium hydroxide acts as an Arrhenius base in water. **(I'm not sure where to start or how to go about this question)

18. Math

Sarah was cutting fabric for a quilt. She cut a strip of fabric that was 19 1/8 inches long into 5 equal pieces. When she was finished cutting Sarah had a piece that was 2 1/4 inches long. How long was each piece that she cut for the quilt?

19. AP tatistics

A horticulturist wishes to estimate the mean growth of seedlings in a large timber plot last year. A random sample of n = 100 seedlings is selected and the one-year growth for each is measured. The sample yields = 5.62 cm. The known standard deviation for

20. Financial Accounting

Wings Inc., a software development firm, has stock outstanding as follows: 25,000 shares of cumulative 1%, preferred stock of \$40 par, and 50,000 shares of \$120 par common. During its first four years of operations, the following amounts were distributed

21. Math

Heather deposits \$3000 into an account that pays simple interest at a rate of 2% per year. How much interest will she be paid in the first 3 years?

22. Chemistry

A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1

23. Calculus

Find the exact area below the curve y=x^3(4-x)and above the x-axis

24. Math

The elevation of the surface of the Dead Sea is -424.3 meters. In 2005, the height of Mt. Everest was 8,844.33 meters. How much highernwas the summit of Mt. Everest?

25. Algebra 2 ..

Simplify. 1. (1/log base 3 of 60)+ (1/log base 4 of 60)+ (1/log base 5 of 60) 2. (log base 16 of x)+ ( log base 4 of x) + (log base 2 of x)=7

26. chemestry

Given the equation C2H4(g)+3O2(g)>2CO2(g)+2H2O(l)+1411kJ, how much heat is released when 8.00g of O2 react?

27. physics

A 85 kg pole-vaulter falls from rest from a height of 6.4 m onto a foam-rubber pad. The pole-vaulter comes to rest 0.48 s after landing on the pad. (a) Calculate the athlete's velocity just before reaching the pad. m/s downward (b) Calculate the constant

28. HARD CHEM QUESTION

A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) 2H2(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: the reaction quotient initially.

29. Math

A cell phone company offers two different plans. Plan A: Monthly fee of \$28 30 free minutes \$0.45 per additional minute   Plan B: Monthly fee of \$40 No free mins \$0.25 per additional minute Determine the time in the mins that results in the same monthly

30. Chemistry

Assume you dissolve 0.235 g of the weak acid benzoic acid, C6H5CO2H, in enough water to make 4.00*10^2 mL of solution and then titrate the solution with 0.138 M NaOH. C6H5CO2H(aq) + OH-(aq) C6H5CO2-(aq) + H2O(l) Find concentration of Na+ at equivalence

31. AP chemistry

A concentration cell consists of the same re- dox couples at the anode and the cathode, with different concentrations of the ions in the respective compartments. Find the un- known concentration for the following cell. Pb(s) | Pb2+(aq, ?) || Pb2+(aq, 0.1

32. Physics (G and g)

Please, I need help with this problem. I would really appreciate it. The top of Mt. Everest is 8850 m above sea level. Assume that sea level is at the average Earth radius of 6.38×106 m. What is the magnitude of the gravitational acceleration at the top

33. American History

Which of the the following was true about the African Americans who moved to California during the mid-1800s? A) They were allowed to testify in court until 1870. B) They were very successful. They mined, established businesses and built schools. C) They

34. Chemistry

Please help!:( What mass of copper would be produced by the reduction of copper(II) ions during pas- sage of 1 ampere of current through a solution of copper(II) sulfate for 89 minutes?

35. General Chemistry

"How would you prepare 150. mL of 0.1M sodium hydroxide given a stock solution of 3.0M NaOH?" I made calculations and figured the process would be to dilute 5 mL of the 3.0M NaOH to 150. mL. Is this correct? For the ideal 150. mL of 0.1M NaOH, I calculated

36. physics

Show that the acceleration of a hamster is 5 m/s2 when it increases its velocity from rest to 10 m/s in 2 s.

37. Physics

What is the momentum of a wavelength= 0.015nm X-ray photon? p= in kg*m/s Please help I am confused. Thank you.

38. trig

Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?

39. physics

A canoe of mass 38 kg lies at rest in still water. A man and a woman are at opposite ends of the canoe 4.0 m apart and symmetrically located with respect to the canoe’s centre (which is also its centre of mass). The mass of the man is 65 kg and the

40. Chem

Citric acid (H3C6H5O7) is triprotic acid which reacts with NaOH according to the balanced chemical equation shown below what volume of 0.200m Naoh is required to titrate 7.50ml of lemon juice which is 0.245 m in citric acid? H3C6H5O7+3NaOH->Na3C6H5aO7+

41. Trig

A plane has a speed of 250mph and flies with a bearing of N35degE. The wind is blowing from the west at 25 mph with a heading of due east. What is the actual speed and heading of the plane? Round to one decimal place.

42. college

a guy wire 27 feet long runs from the top of the pole to a spot on the ground. I f the height of the pole is 6 feet longer than the from the base of the pole to the spot where the guy wire is anchored, how tall is the pole?

43. 5th grade math (word problems)

Mrs. Jones bakes pies. She always cuts each pie into 8 slices. Ther are 13 slices left on the counter. How many pies are on the counter? (write as mixed number). work: 13/8 = 1 5/8 pies. Is this correct?

44. trig

A kite is in the shape of a quadrilateral with two pair of congruent adjacent sides. The lengths of two sides are 20.0 inches and the lengths of the other two sides are 35.0 inches. The two shorter sides meet at an angke of 115 degrees. A. Find the length

45. Chemistry

Find the entropy change of the universe when 2 mol of water freezes at -10 degrees celsius.

46. Physics

A closed box is filled with dry ice at a temperature of -81.5 C, while the outside temperature is 27.4 C. The box is cubical, measuring 0.307 m on a side, and the thickness of the walls is 4.47 × 10-2 m. In one day, 3.37 × 106 J of heat is conducted

47. physics

A 5.00-meter steel beam of uniform cross section and composition weighs 100 N. What is the minimum force required to lift one end of the beam?

48. physics

Show that the average speed of a rabbit that runs a distance of 30 m in a time of 2 s is 15 m/s.

49. Data Mangement- Math

Paula moves to an area with a different telephone exchange. Telephone numbers in the new exchange start with 753, and all combinations of the four remaining digits are equally likely. a) Calculate the probability that the last four digits in Paula’s new

50. physics

A foam plastic ( sg = 0.58 ) is to be used as a life preserver. What volume of plastic must be used if it is to keep 20 % (by volume) of a 75 kg man above water in a lake? Average density of a man is equal to 1.04 g/cc. Assume the foam plastic’s top

51. Life orientation

Name two community organizations that are involved in supporting or giving redress to these factors.explain how these community organizations are involved in redressing these issues.

52. chemistry

A 2.5 g sample of NaOH (Mw = 40.00) was dissolved in water to give a solution of final volume 250 cm3. (i) With reasons, state whether NaOH is a strong or a weak base. Give the conjugate acid of NaOH and decide whether this conjugate acid is acid, alkaline

53. Statistics

A production process produces an item. In a recent study, the company found that 20% of all items produced were defective. Each item is inspected before being shipped. 10% of the items were misclassified( labeled as defective when they were good or labeled

54. physics 52

A car rounds a banked curve where the radius of curvature of the road is R=100m., the banking angle 10 degrees and the coefficient of static friction is .10 (slippery conditions). A) Determine the range of speeds the car can gave without slipping up or

55. Chemistry

Write the product for the reaction when dichlorine oxide (Cl_2O) reacts with water (the product will have only one equivalent of chlorine in it).

56. CHEMISRTY

Calculate the energy required to raise the temperature of 160.0 g Ag from 273 K to 295 K.

57. physics

A canoe of mass 38 kg lies at rest in still water. A man and a woman are at opposite ends of the canoe 4.0 m apart and symmetrically located with respect to the canoe’s centre (which is also its centre of mass). The mass of the man is 65 kg and the

58. Chemistry

Find the entropy change of the universe when 2 moles of water freezes at -10 degrees celsius. The delta G for the freezing of water at -10 degrees celsius is -210 J/mol and the heat of fusion of ice at this temperature is 5610 J/mol.

59. Life orientation

in 10-15 lines critically discuss 5 ways in which teenage pregnancy problem imparts on the community. provide relevant source to support your claims

60. math

a football team gained 12 yards on one play, lost 40 yards on another and gained 34 yards on the last play of the first half. they had already gained 345 yards during the half. what was the total yardage gain for the first half?

61. Chem

Solubility of Silver(I) Carbonate is 3.2x10^-2 g/100mL What is the Ksp? I'm getting 2.19x10^-12 But it's not in the answer sheet

62. Physics

Sophia exerts a steady 40-N horizontal force on a 8-kg box resting on a lab bench. The box slides against a horizontal friction force of 24 N. Show that the box accelerates at 2 m/s2.

63. Physics

A convex lens of focal length 2.5 cm is placed 4 cm from a small object of height 4 cm. Use a ruler and construct the image. Is the image real or virtual, upright or inverted? What is the image distance? What is the height of the image? What is the

64. AP World History

I have to analyze how sub-Saharan Africa & south & south-east Asia's relationship to global trade patterns changed from 1850 to present. please help !

65. calculus

limx→4 4x^2−15x−4/x−4.

66. trig

A pole is braced by two wires that extended from the top of the pole to the ground. The lengths of the wires are 16 feet and 18 feet and the measure of the angle between the wires is 110 degrees. Find, to the nearest foot, the distance between the points

67. Biology

When making comparison of sequences where some are whole genome sequences while others are partial genome sequences, or a specific glycoprotein sequence, How is it that we are able to make comparisons from these sequences if they all have different

68. physics (Newton"s law of gravitation)

Could anyone please help me with this problem? I would really appreciate it. The top of Mt. Everest is 8850 m above sea level. Assume that sea level is at the average Earth radius of 6.38×106 m. What is the magnitude of the gravitational acceleration at

69. Grammar (Ms. Sue)

Some of the underlined pronouns in the following sentences are incorrect. On your paper, revise each sentence that contains an error. If the pronoun is used correctly, write "correct." 1). HORSE is a game that is often played by my friend and I (

70. Physics

The left end of a 1-kg, 1.0 m long uniform thin rod is attached to a pivot, about which it can rotate freely. A force F is applied at the right end of the rod at 30 degree angle to hold the rod stationary in a horizontal position. What is the magnitude of

71. math

Bibi wants to send invitations to some of her friends to come to her birthday party. She has contact information for 37 friends stored on her phone, but she only wants to invite 21 of those people to her party. She tries to send out a message to the 21

72. Chemistry

Assign oxidation states to all atoms in each of the following. explain the order in which you determine the oxidation states for each element if applicable. a)O2 b)HSO4- c)Na2HPO4 d)CrCl3

73. Chemistry

What is the solubility of Ca3(PO4)2 in 0.045 M of CaCl2

74. life orientation

identify and describe 3 environmental health hazards that cause ill health,accidents,crises and disasters within South Africa and globally.

75. pre calc

Use the sum-to-product formula to simplify the expression: If sin 52 + sin 8 = sin A, 0

76. life orientation

5 ways in which the human or environmental problem impacts on the conmunity

77. math

x^2+16xy+y^2-8=0 Write the appropriate rotation formulas so that in a rotated system the equation has no x'y'-term

78. Algebra

As a promotion, a store draws the name of a customers each week. The prize is a coupon for the store. If winner is not present at drawing, he cannnot claim the prize and the amount of the coupon increases for the next weeks drawing. the function f(x)=

79. Physics

Photons of energy 12eV are incident on a metal. It is found that current flows from the metal until a stopping potential of 8.0V is applied. If the wavelength of the incident photons is doubled, what is the maximum kinetic energy of the ejected electrons?

80. Calculus

Graph the parametric equations: x=cos(t) y=sin(t) z=cos(2t) How would I go about solving this problem? thanks!

81. math

Take an 17 by 11-inch piece of paper and cut out four equal squares from the corners. Fold up the sides to create an open box. Find the dimensions of the box that has maximum volume. (Enter your answers as a comma-separated list. Round your answer to three

82. Social Studies... :( help me

Between 1800 to 1860, how long did the slaves work on the cotton field daily?

5.6 x 10-6 mol of A and 5 x 10-5 mol of B are mixed in a 200 mL flask. The system is represented by the equation: 2A(G) + B(G) 3C(G) At equilibrium, there is 4.8 x 10-5 mol of B. Calculate the value of the equilibrium constant.

84. math

Evaluate the following with thought the use of a calculator: Sin70.sin25 + sin65.sin20 And please people explain how you arrived in your answer Lots of love, timmy

85. Music

How did music in the sixties represent/reflect the political and social climate? 3 ways.

86. Chemistry

Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10

87. Economics

Which of these products or services is likely to have an inelastic supply in the short run? A. cargo ships B. haircuts C. newspapers D. staples

88. chemistry

Identify the limiting reagent. 2.43g of magnesium is added to a solution containing 0.100 mol hydrochloric acid t ok produce hydrogen gas.

89. english

i have been asked to correct the sentence would you please assist : 1.when will you eat are you not hungry

90. chemistry

A 32.0-g sample of water at 290. K is mixed with 51.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.

91. physics

A solid disk of radius 6.50cm and mass 1.65kg , which is rolling at a speed of 2.60m/s , begins rolling without slipping up a 10.0 slope.How long will it take for the disk to come to a stop?

92. Chemistry

4, Assign oxidation states for the two elements in the compound OF2. Explain the rules that you use. 5. For each of the following oxidation-reduction reactions of metals and nonmetals, identify the element that is oxidized and the element that is being

93. chemistry

What is the solubility of Ca3(PO4)2 in 0.06 M of K3PO4

94. Life Orientation

Identify one environmental or human factor that causes ill health or accidents or disasters within your community or any other community within South Africa.

95. Life orientantion

Identify one environmental or human factor that causes ill health.

96. US History

I Need Help to Start my Thematic Essay, Theme is change- Throughout united states history individuals other than presidents have played significant roles that led to changes in the nations economy, government, or society. I need help to restate this for my

97. grammar

What part of speech is the word run in the following sentence? I have a run in my hose.

98. chemistry

in relation to the pH of pure water at 25 degree Celsius where do the pH values of acid fall

If cos^4 3 x - sin^4 3 x = cos (g(x)), then g(x) = ??. For part (b), use a^4-b^4=(a^2-b^2)(a^2+b^2)!

100. Science

Are the ions of a metal very different from the atoms of a metal?

101. english

Book: Information you’ll need to cite a book Example- Powell, Kevin, ed. Step into a World: A Global Anthology of the New Black Literature. 2nd ed. New York: Wiley, 2000. 1. Author(s) or Editor(s)- last name, first name, middle is any, followed by a

102. mathematics

Find the smallest prime number N such that the following is true: The largest prime factor of N−1 is A; The largest prime factor of A−1 is B; The largest prime factor of B−1 is 7.

103. math

Three students, Chris, Vlad, and Steve, are registered for the same class and attend independently of each other. If Chris is in class 80% of the time, Vlad is in class 85% of the time, and Steve is in class 90% of the time, what is the probability that at

104. Subject:life orientation

What are the institutions/community organizations tha are involved in supporting or giving redress to these disasters of hiv and aids.explain how these organizations are ivnolved in providing a safe and healthy environment.

105. rrational function

find the vertical asympotate f(2x)/x^2-4

106. Computer Programming

I am trying to put the following in Python Code. I know how to do it mathematically, but code - not sure where to start. A state creates license plates that each contain two letters followed by three digits. The first letter must be a vowel ( A, E, I, O, U

107. wesley

there will be a coin toss to determine the winner of the \$5 million prize. You are offered \$100,000 for your ticket right now. What would you do?

108. L.o

Identify one environmental or human factor that causes ill health?

109. Math

What is the distance on the ground between 2 posts when the posts are attached to a platform that is 6 feet square and attached with 15 degree brackets? The posts are either 10 foot or 12 foot. Please answer for both.

110. English

What are the shifts in meaning of the word "Conquest"?

111. Life orientation

Identify and describe 3 enviromental health hazards that cause ill health,crises and disastres within your community or any other community within south africa and globally

112. Grammar (Ms. Sue)

Complete each sentence below, using an objective pronoun. Then, tell how each pronoun is used in the sentence. 1). Skipping rope is a good form of exercise. Some athletes use (?) in their training. 2). My sister loves to jump rope. It gives (?) a chance to

114. life oringtation

in 10 to 15 lines what are 5 ways in which the human or environmemt problem impacts on the comunty

115. life oringtation

in 10 to 15 lines what are 5 ways in which the human or environmemt problem impacts on the comunty

116. pre calc

(cos3x)^2+(sin3x)^2=cos(f(x)) find f(x)

117. agricultural science

outline and explain the objectives of fencing a farmland?

118. agricultural science

outline and explain the objectives of fencing a farmland?

119. precalc

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

120. agricultural science

outline and explain the objectives of fencing a farmland?

121. accounting

Cindy Lou makes \$30,000 per year as an exempt employee. She worked 15 hours of overtime in the month of September. Payday for wages earned in the month of September is October 7. Ignoring Federal and State income tax withholdings, how much would she

122. sew

A chemical substance that causes dyes to set is called?

123. Physical Science

When will an object float on a fluid's surface? My answer: An object will float on a fluid's surface if only the object is less dense than the fluid?

124. life orientation

what are the institutions/community organization that are involved in supporting or giving redress to these disasters? And how are these organizations are involved in providing a safe and healthy environment?

125. Life Orientation

Explain 5(or more)factors that contribute to the substance abuse of both Legal and Illegal drugs among the youth

126. Math (Statistics)

Two Cards are drawn without replacement from a deck of 52 cards. What are the odds in favor of drawing two honour cards (A,K,Q,J,10)?

127. Science

When will an object float on a fluid's surface? My answer: An object will float on a fluid's surface if only the object is less dense than the fluid?

128. Calc

HOW TO INTEGRATE : 2π∫x√(1+4x^2exp(-2x^2)) Thank you,

129. Life orientation

Discuss ways poverty in the community/in schools problem impacts

130. maths

how many square tiles each with side 20cm must be used for a square flooring with sides 10m

131. precalc

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

132. precalc

(cos3x)^4+(sin3x)^4=cos(g(x)) find g(x)

133. Chem

A mixture of He Ne and 3rd gas exhibit a total pressure of 486 mm hg if the partial pressure of He125mm mm hg and partial pressure of Ne is 214mm hg what is the mole fraction of the 3rd gas in container

134. science

comets orbit the sun in a what pattern

135. L.o

Which are the two institutions that help to redress air pollution?

136. chemistry

If 10.4 liters of O2 at STP are produced by the electrolysis of water, how many coulombs of charge were required?

137. Math

How do you find the total number of maximum and minimum points of the function whose derivative is given by f^1(x)=x(x-3)^2(x+1)^4 ???

138. Chemistry

calculate the ph 25.00 mL solution of 0.125 M acetic acid (Ka= 1.75 x 10^-5) after the addition of each of the following volumes of 0.100 M KOH: 10.00 mL, Vep and 35.00 mL

139. physics (Newton's law of gravitation)

Can anyone please help me with this question? I am really confused. A neutron star and a black hole are 2.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030

140. math

1000 [? ] 81 [?] 190 = 10 use BODMAS method

141. Life Orientation

What 5 ways which the human or environmental HIV/AIDS problem impacts on the community?

142. Calculus

Find the area of the region. f(x) = x^3 g(x) = x^4 In the graph f is above g and they both intersect at (1,1)

143. Calculus

Graph the parametric equations: x=cos(t) y=sin(t) z=cos(2t) How would I go about solving this problem? thanks!

144. English

What is the last step for planting potatoes? 1. It is to water well. 2. Water well. 3. It is "Water well." (What is the suitable answer for the question?)

145. English

Who often joins Sony's family for dinner? 1. Anton's family often joins Sony's family. 2. Anton's family often join Sony's family. (Which one is correct? Do we have to use 'join' or 'joins'?)

146. math

Give 0.7ml of metoclopramide syrup very six hours anwer 1 tsp oral syringe with 1 ml marking Who help

147. English

1. At the dacha, what does Sony's family grow? 2. At the dacha, what do Sony's family grow? (Which question is correct?) 3. They grow vegetables like potatoes and tomatoes. 4. Sony's family grow vegetables like potatoes and tomatoes. 5. Sony's family grows

148. statistics

To get an A grade on the test, you need a total score of more than 16 points. One of the students knows the correct answer to 6 of the 20 questions. The rest she guesses at random by tossing a coin (one toss per question, as in 4B). What is the chance that

149. Life orientation

Recommandation on how to address hiv/aids

150. MATH

Let U = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}. (Enter your answers as a comma-separated list. Enter EMPTY or Ø for the empty set.) {1, 4, 8} union {3, 7, 9}

151. Physics (Electric charge for charged rods)

I need help with this question, please. What is the direction of the force between (a) two particles whose charges are the same sign and (b) two particles of opposite sign? (c) What happens to the magnitude of the force when the distance between two

152. Physics (Electric fields and Coulomb's Law)

I need help with this question please. An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized, and has a charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion? _________ m

153. physics (Newton"s law of gravitation)

Please, can someone help me with this? A neutron star and a black hole are 2.400e+12 m from each other at a certain point in their orbit. The neutron star has a mass of 2.78×1030 kg and the black hole has a mass of 9.94×1030 kg. What is the magnitude of

154. chemistry

Determine how much of each product (in g or L) is formed. 2.50g of aluminum metal is placed in a large container of concentrated copper (ll) suflate to produce copper metal.

155. Science

Joe pushes a lawn mower four times as far as Mary while exerting only half the force, who does more work? And by how much?

156. English

At the end of the play, Mrs. Popov and Smirnov appear to be in love. Considering what has happened in the play, why is this ridiculous?

157. Maths

Given that on average, an atom of gold weighs 3.27×10^−22grams, how much does an Avagadro’s number of gold atoms weigh (take Avagadro’s number to be 6.0221415×10^23).

158. math numerical methods

Consider the following second order differential equation: y"-2x^(2)y+y^(3)=17cos(4x) with y(0)=4 , y'(0)=-9 If we let u=y and v=y′ then as an AUTONOMOUS first order system, the second order differential equation is correctly expressed as:

159. environment

What are the two institutions/community organizations that are involved in supporting or giving redress to these disasters of hiv and aids?

160. Calculus

Find the derivative of f(x)=ln(e^(2x)/((x^2-4)^3) Please show detail so I can use for reference. Thanks!

161. physics

A neutral solid conducting cylinder rotates about its axis with angular speed 1600 rad/s. In addition, there is an external magnetic field of induction B directed along the cylinder's axis. What must the magnitude of the magnetic field in Teslas so that

162. physics

The velocity of sound in the atmosphere is c=300 m/s. An airplane is traveling with velocity v=600 m/s at an altitude of h=8 km over an observer. How far horizontally past the observer in kilometers will the plane be when the observer first hears

163. Math

How many hours does it take for the hour hand to travel as far as the minute hand travels in 40 minutes?

164. Math

How many hours does it take for the hour hand to travel as far as the minute hand travels in 40 minutes?

165. Life orientation

10 ways in which the environmental health hazard can impact on one's health

166. pre calc

(cos^2)3x+(sin^2)3x=cos(f(x)) simplify expression and find f(x)

167. Life orientation

What impact causes by cancer on the teenager?

168. pre calc

((cos^4)6x)-(sin^4) 6x=cos(g(x)) find g(x)

169. math

To select a _________ sample, the population is divided into disjoint subgroups according to some characteristics like income level, and then a few individuals are selected randomly from each of the subgroups to be in the sample. (Points : 1) (May choices

170. english

does the word "from" get capitalized in a title?

y=x+1 x+y=3

172. psychology

KINDLY GIVE ME 2 PARAGRAPHS, WHY BRAIN IS IMPORTANT?THANK YOU

173. Geometery

Trapezoid. A = (5+4) x 11/2 = 49.5 Long side is 11 in. bottom base is 4 in Correct? Or you need more info?

Discuss 5 ways How does human or environmental problems impact on the community

175. English

What are the shifts in the meaning of the word "CONQUER"? How can they be characterized and what might account for these changes? Thank you

176. organic chemisty

write raction of benzoic acid with propylamine

177. Electric charge and Coulomb's Law

Can anyone help me explain this problem? Your help is appreciate it. You are given an apple and an orange. The apple has a net charge of +3×10−17 C. The orange has a net charge of −3×10−17 C. With only this information, can you determine which one

178. Electric fields and Coulomb's law

Can anybody please help me with this question? Two friends are playing a version of proton golf where the hole is marked by a single proton. The first friend reads his meter, and declares he has a field strength of 27.5 N/C. The second friend looks at her

179. Electric fields and Coulomb's law

Please, I need help with this question. An ion harvester is scouring deep space for isolated xenon (Xe+) ions. A xenon ion is singly ionized, and has a charge of +e. If the field meter reads 0.000000202 N/C, how far away is it from the ion?

180. Calculus

Find the derivative of the following: f(x)=ln(e^(2x)/(x^2-4)^3 Please show all steps so I can follow Thanks!

181. Calculus

Use logarithmic differentiation to find the following derivative y=(x+6)^4/(x-5)^6. Please show all steps so I can follow for future understanding. Thanks.

182. Calculus

Use logarithmic differentiation to find the derivative of the following: y=x^x^2 x>0 Please show all steps so I can following for future understanding

183. Science

Doe sodium chloride completely dissolve,partially dissolves or insoluble

184. Science

Doe sodium chloride completely dissolve,partially dissolves or insoluble

Prove the following: sin(x+y)sin(x-y) = cos^2 (y) - cos^2 (x)

186. math

how many ways could somebody make a house rectangular house if she used 23 connecting cubes?explain

187. chem!

You work with the following system: 2X(g) Y(g) At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.

188. math

Find the distance around the track if x=20 feet and y=25 feet

189. algebra 1-2

what is a natural number?

190. Physics

A long straight horizontal bar vibrates in a ver tical direction with a frequency of 1.50 Hz on the surface of a large tank of water. The vibrations of the bar cause plan e waves to travel across the surface of the water. The waves are described by the

191. Chemistry

What are the Six possible ratios for the equation for the formation of potassium chloride?

192. Chemistry

What are the Six possible ratios for the equation for the formation of potassium chloride?

193. Writing: Word usage

What do you call a side result of something? As in A caused B (the intended result) and A also caused C (an unintentional result that occurred, but was beneficial)?

194. math

A polynomial f(x) has degree 8 and f(i)=2^i for i=0,1,2,3,4,5,6,7,8 . Find f(9).

195. Math

If Ethan ate 4 times as many cookies as Daniel who at 2 times as many as Courtney how many cookies did Ethan eat if Courtney ate 2.

196. math

1/2x+1/3y=-7 1/2x+2y=-4

197. chemistry

what is the h+ of a solution with a ph of 10 at 25 degree celsius

198. chemistry

what will be the internal pressure causes by hydrogen gas when 5.00 g of zinc is dissolved in 50 g of concentrated hydrochloric acid if the volume of the container is 250 mL and the container is allowed to cool 20 degrees celcius

199. For the function defined by...HELP

For the function defined by f(x)=3x^2+5x+2, find the following values. (a) f(-4)= (b) f(-x)= (c) -f(x)= (d) f(x+h)=

200. Math

what is a exponential notation?

201. Music

How was rock a revolutionary and democratic music?

202. real estate finance

Sue is appraising a property using the cost approach. The and (if vacant) has a value of \$90,000. The house was built in 1982, has 2300 square feet and she has estimated it has an economic life of 90 years. The replacement cost on this type of construction

203. physics

A block of mass m = 7.0 kg is dropped from a height H = 46.0 cm onto a spring of spring constant k = 2360 N/m (see the figure). Find the maximum distance the spring is compressed.

204. social studies

what is one power given to the state government in the Constitution?

205. Chemistry

Calculate the H3O+ ion concentration and the pH at the equivalence point when 45.0 mL of 0.4000 M NH3 is mixed with 45.0 mL of 0.4000 M HCl. Ka=5.6x10-10

206. eco,

Suppose that a vegetable vendor pays 7% interest daily on a \$10 loan. Then, suppose that this individual was able to save \$0.50 per day by drinking less tea. Calculate the number of days it would take for the vendor to no longer need to borrow money in

207. maths

if a=3+2root2 then find the value of a square- 1by a square?

208. fractions

what is 4 2/8 plus 5 6/7.

209. management for organization

Which of the following theories belongs to the modern era of management? (Points : 1)

If x

212. math

I need help solving this problem please. Solve the equation. (x-2)(2x+1)=0

213. Solving an Equation in one variale

If x belongs Z, Solve the equation sq.rt(1) + sq.rt(2) + sq.rt(3) + .......... + sq.rt(x^) + sq.rt(x^+1) + sq.rt(x^2+2) = 5190

214. Math

If a Ferris wheel has a 64 m radius and the center ot the wheel is 84 m above the ground, what is the height of a carriage above the ground starting from 0 degrees to 360 degrees?

215. Microeconomics

Is leisure time considered an inferior good when the substitution effect dominates? I think that the answer is yes because if you are willing to work more hours in order to make more money than you do not value leisure time that much. Is this correct?

216. Math

Square root of 512rs^6 * square root of t^3

217. Computer Science

What is the fastest way to compare two strings containing only numbers. eg: "3423492349328492343.939842903482304" "349832498234932.92384924893294343" There can be at max 20 numbers before and after the decimal place. The majority will be around 20, however

218. mathematics

4 distinct integers p, q, r and s are chosen from the set {1,2,3,…,16,17}. The minimum possible value of p/q+r/s can be written as ab, where a and b are positive, coprime integers. What is the value of a+b?

219. mathematics

What is the largest 3 digit divisor of N=1024^3−639^3−385^3?

220. social studies

Why did pilgrims travel? a. to fight a holy war b. to organize followers c.to pay tribute to a king d. to visit holy places

221. mathematics

Suppose f(x) is a degree 8 polynomial such that f(2^i)=1/2^i for all integers 0≤i≤8. If f(0)=a/b, where a and b are coprime positive integers, what is the value of a+b?

222. Chemistry

Propose buffer components to hold a pH of 3.5, let the acid have a concentration of 0.1 M show all work

223. Chemistry

Propose buffer components to hold a pH of 9.5, let the base have a concentration of 0.1 M show all work please

224. Chemistry

what happens to a battery when it is "recharged"

225. Math

Roulette is a well known game in which a mechanical device randomly selects one of 38 equally likely numbers. IF a player decides to play by choosing a number, he gains \$35 if his number is selected by the device. If any other number is selceted he loses

226. Biology

How many daughter cells will one cell have after 3 complete meiosis processes? Answer A) 8 B) 12 C) 16 D) 64

227. math

prove nC(r-1) + (n+1)C(r-1) + (n+2)C(r-1)+ ... +(n+k)C(r-1) = (n+k+1)Cr

228. Physics

So if mgh=1/2mv^2 and I'm solving for v is my answer going to be v= squareroot of 2* (gravity) 9.8m/s^2* (height) 3.67m?