# Questions Asked onApril 24, 2013

1. ## spanish

No me gusta esta falda. Prefiero . (that one) Voy a comprar pantalones verdes. (these) ¿Dónde compraste abrigo? (that) ¿Viste a chicas? (those over there) Tú compras esa camisa y yo compro . (this one) ¿Cuáles prefieres, los zapatos marrones o

2. ## Finance

You are considering two lottery payment options: Option A pays \$10,000 today and Option B pays \$20,000 at the end of ten years. Assume youc an earn 6 percent on your savings. Which option will you choose if you base your decision on present values? Which

3. ## trignometry

In the right triangle shown below, the length of AB is 8 units, ¡ÏA measures 60¡ã, sin 60¡ã ¡Ö 0.866, cos 60¡ã ¡Ö 0.5, and tan 60¡ã ¡Ö 1.73. Approximately how many units long is BC , to the nearest hundredth of a unit? A. 4.00

4. ## chemistry

Part A Identify the anode and cathode, and indicate the direction of Na+ ion and NO3 - ion flow from the salt bridge. 1) Al is the anode and Co is the cathode; Na+ ions flow into half-cell compartment (A) and NO3 - ions flow into half-cell compartment (B).

5. ## akgebra

One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

6. ## Math

Let f(x)=2x^2+3px-2q and g(x)=x^2+q,where p and q are constants.It is given that x-a is a common factor of f(x) and g(x) ,where p ,q and a are non-zero constants.Show that 9p^2+16q=0 .

7. ## geometry

A 7-inch apple pie sells for \$4. What is its cost per square inch (in Sq.?

8. ## math 5th

Estimate the area of the circle and use 22/7 for pie. Teh circle shows line all the way accross measruing 28cm. Find area. Can some one explain how

9. ## statistics

Suppose that the test scores for a college entrance exam are normally distributed with a mean of 450 and a standard deviation of 100. If a student is selected at random what is the probability that the student will score above 600?

10. ## Algebra

The sum of three consecutive odd numbers is 39. What are the smallest of these numbers?

11. ## math

Juan is making cookies. He uses 3/4 cup of flour in each batch of cookies. He making 6 batches of cookies. How much flour will he use

12. ## Math 7th Geometery

I have a complex figure like a U shape. I understand the formula for this is l x w = a Can you show me the steps? 31m is parael to 31m this would be the height (sides of the U)?? or is this the width? Length 69m Width is on the right top of U 23m. Inside

13. ## Science

Using two or three well-developed paragraphs, describe how energy is transferred from the sun to producers and on to consumers. Provide at least one example.

14. ## Public Speaking

A speaker talking about the benefits of cosmetic surgery to an audience primarily of women is appealing to which level of needs in Maslow’s Hierarchy of Needs? A. Physiological needs B. Esteem needs C. Belongingness and love D. Safety needs

15. ## algebra

An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial

16. ## math 7th

When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds? Can some one help with the steps?

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. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

18. ## Physics

Moment of inertia of a 'non-uniform' ring of mass M and radius R about axis through centre and normal to its plane is

An oscillating block-spring system has a mechanical energy of 5.1 J, an amplitude of 0.81 m, and a maximum speed 1.6 m/s. Find the spring constant k of the spring. What is the mass of the block? What is the frequency of oscillation?

20. ## physic

3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell

21. ## Life orientation

Factors that causes ill health,accidents,crises,and disaster

22. ## math

IN a scale drawing each side of a pentagon is 1.9 cm long. what is the perimeter of the actual object when the scale drawing is 1 cm=6.5

23. ## Chemistry

In the qualitative analysis scheme, what qualitative analysis principles are used to separate Cu2+ from Al3+? Check all that apply. -Selective precipitation -Fractional precipitation -Amphoteric precipitate solubilization -Competitive equilibrium

24. ## Probability

Two equally matched teams are playing a game of volleyball. Each team has a 1/2 chance of winning each point. The game ends once one of the teams gets to a score of 21. If the score is currently 18-16 for team A, the probability that team A will win the

25. ## Chemisty

if 1.00 g of silver nitrate is combined with 1.00g of sodium chloride what is the mass of the solid if you have 75% yield?

26. ## Physics

A ceiling fan starting from rest reaches an angular velocity of 30 rev/sec in 5 sec. What is the angular displacement of the fan during these 5 sec? Can you show me the steps need to figure this question out? Thanks!

27. ## Math

Find the exact solution, using common logarithms, and a two-decimal-place approximation of each solution. log(7x + 4) = 2 + log(2x − 3) Solve the equation. log(x^3) = (log x)^2

28. ## Chemistry- Acid-base titration

The indicated endpoint of an acid-base titration seldom occurs at a ph of 7. what determines the ph of the endpoint??

29. ## math

What is the difference between the number of possible answers on a five question true-false test and a five -question multiple choice test withfour choices per question

30. ## Physics

What amount of heat is required to raise the temperature of 350 grams of copper to cause a 25°C change? The specific heat of copper is 0.39 J/g°C A. 2500 joules B. 2600 joules C. 3400 joules D. 3900 joules

31. ## Physics

The distance between the centers of the wheels of a motorcycle is 169 cm. The center of mass of the motorcycle, including the rider, is 77.0 cm above the ground and halfway between the wheels. Assume the mass of each wheel is small compared to the body of

32. ## Pre-Calculus

Simplify arctan 1/3 + arctan 2/3(round to the nearest degree).

33. ## life orientation

Name two institutions/community organisations that are involved in providing a safe and healthy enviroment (suggestion: find out about NGO 's or other organisations in your community or city)

34. ## Physics

A solid cube (side=2.54 cm) of aluminum (p=2.70x10^3 kg/m^3) is attached to a vertical cord. (a) Find the tension in the cord if the cube is in air. (b) Find the tension in the cord if the cube is fully immersed in water (p=1.00x10^3 kg/m^3).

35. ## calculus

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s squared?

36. ## chemistry

calculating the molarity of acetic acid in a vinegar sample given that 5.00 of vinegar required 43.50 mL of 0.1050 M NaOH to just reach the methyl red endpoint.

37. ## Physics

A balloon of negligible mass is filled with helium gas (p=0.179 kg/m^3) until its volume is just large enough to lift a 25.0 kg load. (a) Find this volume. (b) Find the buoyant force exerted by air (p=1.29 kg/m^3) on the balloon.

38. ## Calculus

Part I The change in annual revenue in thousands of dollars for the Ozark Zip Line Corporation has been modeled by the function. R(x) = 8.2x^2 + 23.1x where x is the number of years after 2000. To find the total revenue gained between the years 2002 and

39. ## Math

If a problem is 4^4/4^6 is it = to 1/4^2 or just 16?

40. ## Physics

A van drive 17.5km north. Then it turns west and drives 9.1km. The van then drives 14.5km south. The entire trip takes 40 minutes. What is the average velocity of the truck? I know avg velocity is displacement/time elasped, but I can not figure out what

41. ## Math

14,903,256 Write the digit in the ten millions place.

42. ## Physics

Assume that 60.0 m/s wind (during a hurricane) is blowing past a 1.50 m by 1.50 m glass windo in a house. Find (a) the pressure difference "delta"P=P(in)-P(out) and (b) the force (Magnus force)tending to blow this window outward. Let the air density p=1.20

43. ## S.S

what does the indus river valley have in common with the Mayan civilization ? I need help on my study guide

44. ## Math

just checking ...is 7^4/7^2 = to 49... I say yes...?

45. ## chemistry

When sulphur dioxide is dissolved in water and a drop of Universal Indicator was added the indicator, what colour would the indicator turn ?

46. ## life orientation

about hiv/aids;which problem impacts does HIV/AIDS have on human or the environment?

47. ## Math

Compute the number of vinyl tiles, measuring 25 cm each side, needed to tile a kitchen measuring 102 ft. by 18 ft.

48. ## algebra 1

What is b^2-b/2

49. ## ?

If there are 56 questions and you miss 10 what would your grade be? Your grade would be a 81.88 I divided 100/56 and got 1.78 than I multiplied how many questions I would get right by 1.78. So 46x1.78=81.88

50. ## Physics

A constricted horizontal tube of radius r(1)=4.00 cm tapers to a tube of radius r(2)=2.50 cm. If water flows at speed 2.00 m/s in the larger tube, (a) find the speed of the water v(2) in the smaller tube. (b) Find the flow rate in this tube.

51. ## algebra

Complete the following word problems. 14.It takes 9 hours for Isabella to rake leaves by herself,but her brother Matthew can work three times as fast.If they work together, how long will it take them to rake leaves? Rate Time Work Done Isabella Matthew

An automobile travels at a constant speed around a curve whose radius of curvature is 2000m. What is the maximum allowable speed if the maximum acceptable value for the normal scalar component of acceleration is 1.5m/s^2?

53. ## Physics

A 100.0 cm long brass rod is heated from 20 degrees C to a final temp of 100 degrees C. Find the change in the length of the rod. (a-19.0x10^-6/degree for brass)

54. ## Physics

A 16.0 gallon steel tank is topped off with gasoline at 0 degrees C. With the lid off, the tank is left outside where the air temp is a sizzling 40.0 deg C. How much gasoline overflows? (assume a=12.0x10^-6/degree C for steel, B=950.0x10^-6/deg C for

55. ## science and english only for ms sue

what the steps to the water cycle and what is the writing process and what the steps for 7th grade and please help me as soon as possible please ms. sue...

56. ## math

What is the benefit of using a longer ramp opposed to using a shorter one?

57. ## Physics

48.0 g of oxygen (O2 is diatomic) are confined in a rigid 1.00x10^3 L cubical container at temperature 300.0 K. Find the gas pressure and the force exerted by the oxygen gas on any of the six faces of the cube. Mass number of an oxygen atom is 16.0

58. ## math

someone please help me slove this problem. Use the qudratic formula to find any x-intercepton the graph of the equation. y=4x^2-2x-5

59. ## Life orientation

What are the institutions/ community organisations that are involved in supporting or giving redress to teenage pregnancy in South Africa

When UV light of wavelength 295nm falls on a metal surface, the maximum kinetic energy of emitted electrons is 1.50eV. What is the work function of the metal? W0 in eV

61. ## science

How do you test luster of a mineral?

62. ## Science

Waves carry energy from place to place without carrying matter. true false I think it is true??

63. ## Math

26 people surveyed, 19 said they like basketball, 12 said they like football, and 5 said they like both. How many people said they like basketball but not football?

64. ## math

Beer cans are right circular cylinders. My Mathematical Mead, My Polynomial Pilsner, and my Square-root Stout cans, from the Schmidt Brewery, have dimensional units called "brewskies." They have a volume (in cubic brew skies) equal to a solution of the

65. ## math

I need help solving this equation please. Use the qudratic formula to find any x-intercepton the graph of the equation. Y=3x^2+9-1

66. ## Math

What formula to use when finding patterns of sum of unit fractions #egyptian fractions

67. ## statistics

if no preliminary sample is taken to estimate p, how large a sample is necessary to be 87% sure that the point estimate will be within a distance of 0.04 from p?

68. ## math

If a rocket is shot upward with an initial speed of 176 feet per second from a platform 64 feet above the ground, when will the rocket be at its maximum height and how high will it be? Hint: The graph of a parabola is symmetric.

69. ## math

Mighty Mouse (who flies at a constant speed of 600mph) was standing by a cannon that was pointed straight up. A cannonball was shot vertically into the air with an initial velocity of 300 mph. Exactly one second after the cannon was fired, Mighty Mouse

70. ## Math

For a seesaw that 14 ft long, where should the fulcrum be placed to balance a 204 lbs adult and a 81.6 lbs child?

71. ## Math 111

Suppose that \$5000 is invested in an account with an account with an APR of 12% compounded monthly. Find the future value of the account in 5 years.

72. ## math

320= -5a + 5 (1-8a)

73. ## Math

Greta says that the expression (2xa)+5 is the same as 2x(a+5). Is she correct?Why or why not?

74. ## Math Geo help Ms Sue?

I have two questions about two circles. A.First circle shows half a line measuring 4mm using 3.14 for pie. I came up with an answer that is wrong.:( B.Second circle same pie but with a line all the way across the circle measuring 18cm. I got this one

75. ## geometry

find the capacityof a cylidrical drinking flask whose radius is 3.42 cm height of 16.33?

76. ## Math

Write multiplication sentence for 4 4/5+ 4 4/5 + 4 4/5

77. ## statistics

adult males have normally distributed heights with mean of 69.0 in and a standard deviation of 2.8 in. if a clothing manufacture decides to produce goods that exclude the shortest 12% and the tallest 12% of adult males, find the minimum and maximum heights

78. ## life orientation

identify and describe 3 environmental health harzards that cause ill health,crises,and other disasters within your community or any other community within South Africa and globally.include evidence that is current of the identified issues.

A 0.98 N bird descends onto a branch that bends and goes into SHM with a period of 0.46 s. Determine the effective elastic force constant of the branch.

80. ## statistics

A study of 36 marathon runners showed that they could run at an average rate of 7.8 miles per hour. The sample standard deviation is 0.6. Find a point estimate of the population mean. Find the 90% confidence interval forthe mean of all runners. Based on

81. ## VASTS (space)

Rags, tie wraps, and safety wire are examples of what type of contamination?

82. ## Life orientation

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

83. ## Physics

A sound wave has a frequency of 686 Hz in air and a wavelength of 0.50 m. What is the temperature of the air?

84. ## Maths

If A and B are two friends and sold tickets for Rs. 3800. If A sold 11/8 times as that by B, how much did each of them sell.

85. ## definition

Phenomenon means: 1) tragedy 2) dissapointment 3) event 4) crisis I think it's 4, crisis

86. ## math

simplify the expression 14/(3x)+(x+5)/(3x)

87. ## geometry

find the capacityof a cylidrical drinking flask whose radius is 3.42 cm height of 16.33?

88. ## AP US History

One of the ironies of World War I was that in a war 'to make the world safe for democracy,' the government attacked the civil liberties that make democracy possible.

89. ## bio physics

A 2.80kg block of copper with a height of 0.250m and an area of 1.26 X 10^2 is floating in a tub of liquid mercury. How far from the surface of the mercury is the bottom of the block? Hint: you need to start with Newton's second law

90. ## math

simplify the expression 4/(x+2)-3/(x+2)

91. ## math

simplify 3/x+2/x^2

92. ## physics

A sound wave has a frequency of 686 Hz in air and a wavelength of 0.50 m. What is the temperature of the air? -Find wavelengths for 20 hz: -Find wavelengths for 20,000hz:

93. ## Math 112

A jar of water weighs 15 pounds. When 0.5 of the water is poured out, the weight of the remaining water and the jar is 8.75 pounds. How much does the jar weigh?

94. ## math

zena earned \$12 and she spent \$8 what fraction of her earnings did she spend?

95. ## Algebra 2....

simplify -3x^2( 6xy- 2x^3 y^2 z)

96. ## math

What is the real part of (2+i)(6−i)?

97. ## algebra 1

Solve the rational equation. 3/(x)+6/(x+3)=8/(x+1)

98. ## CALCULUS

Let the line l0 be defined by x = 1−t, y = 2+3t, z = 1−2t. Determine whether each given line intersects l0. If it does, give the intersection point. l1 :x=2+t, y=5−2t, z=1+3t l2 :x=6+2t, y=1+t, z=5+t

99. ## algebra 1

Divide x^2+3x-18 by x-3

100. ## Grammar root

I usually write with a .....? I carry my books in a ......?

101. ## social studies

Who was the firs president in 70 years that was not part of the Institutional Revolutionary Party?

102. ## Grammar root

I usually write with a .....? I carry my books in a ......?

103. ## math

x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13. What is the sum of all (distinct) possible values of x?

104. ## physics

Objects A and B have the same mass of 3.4 kg and are at their melting points. They melt when 4.9 × 104 J of heat is added to A and when 11 × 104 J is added to B. (a), (b) Determine the latent heat of fusion for the substance from which each object is

105. ## Life orientention

Way to deal with environmental factor which cause accident,crises and disaster

106. ## math

a and b are consecutive, positive integers such that a2−b2>22. What is the minimum possible value of a+b?

107. ## Physics

The range of human hearing extends from approximately 20 Hz to 20,000 Hz. Find the wavelengths of these extremes at a temperature of 26°C. -Find wavelengths fron 20 hz: -Find wavelengths for 20,000 hz:

108. ## Buisness

Kodak made film and was the major employer in Rochester, New York. When digital photography decreased film sales, Kodak laid off two-thirds of its work force, but Rochester did not become a ghost town. Why? A)taxes went down B)the local economy had other

109. ## calculus

3) A shell is fired from ground level with a muzzle speed of 350 ft / s and elevation and angle of 60 . Find (a) parametric equation for the shell’s trajectory (b) the maximum height reached by the shell (c) the horizontal distance traveled by the shell

110. ## maths

what length is each side of a rhombus if its perimetre is 120cm

111. ## English

I or me? "Did you know that it was (I, me) who called?"

112. ## math

The four values x, y, x−y and x+y are all positive prime integers. What is the sum of all the four integers?

113. ## physics

A group of hikers hears an echo 2.50 s after shouting. If the temperature is 20.0°C, how far away is the mountain that reflected the sound wave?

114. ## math

a,b and c are positive integers such that the simultaneous equations (a−2b)x=1, (b−2c)x=1 and x+25=c have a positive solution for x. What is the minimum value of a?

115. ## m

x and y are real numbers that satisfy the equations x2+y2=125 and x+y=13. What is the sum of all (distinct) possible values of x?

116. ## physicis

A freight car, open at the top, weighing 2.80 tons, is coasting along a level track with negligible friction at 4.10 ft/s when it begins to rain hard. The raindrops fall vertically with respect to the ground. What is the speed (in feet/second) of the car

118. ## english

these are questions based on the book to kill a mockingbird 1. how does atticus explain to scout a way of getting along in school and with other people, in chapter 3 2. why does atticus think it is just as well that the ewells do not attend school, chapter

119. ## physicis

A body of 8.10 kg mass makes an elastic collision with another body at rest and continues to move in the original direction, but with one-fourth of its original speed. What is the mass (in kilograms) of the struck body?

120. ## physicis

A block of mass m1 = 4.00 kg slides along a frictionless table with a speed of 16.0 m/s. Directly in front of it, and moving in the same direction, is a block of mass m2 = 5.00 kg moving at 7.00 m/s. A massless spring with a spring constant k = 1220 N/m is

122. ## physics

An alpha-particle collides with an oxygen nucleus which is initially at rest. The alpha-particle is scattered at an angle of 67.0 degrees from its initial direction of motion, and the oxygen nucleus recoils at an angle of 52.0 degrees on the other side of

123. ## rty

april, bill, candace and bobby are to be seated at random in a row of 6 chairs

124. ## english

questions based on the book to kill a mockingbird: describe mr radley(not nathan radley. what does jem do to thank their mysterious benefactor and what happens after.

125. ## Geo

How do Ifind the volume for a prism cube with three known measures? Ht 8mm W 5mm length 10.4

126. ## physics

A 8.30 kg object with a speed of 34.0 m/s strikes a steel plate at an angle of 45.0 degrees with the normal to the plate, and rebounds at the same speed and angle on the other side of the normal. What is the change (in magnitude only) of the linear

127. ## physics

A pellet gun fires ten 3.00 g pellets per second with a speed of 840 m/s. The pellets are stopped by a rigid wall. What is the average force (in newtons) exerted by the pellets on the wall?

128. ## physics

An alpha-particle collides with an oxygen nucleus which is initially at rest. The alpha-particle is scattered at an angle of 67.0 degrees from its initial direction of motion, and the oxygen nucleus recoils at an angle of 52.0 degrees on the other side of

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. What would happen if the wavelength of the incident photons was tripled? Would the energy be 4eV,so 12/3=4, and

130. ## Geo.

draw two parallel lines in quadrants 1 and two that are ten blocks apart

131. ## Life orientation

Provide recommendation on how to address water pollution in the community within South Africa(15 marks)

132. ## Math

Stefan drove 558 in 9 hours. He then drove 120 miles in 3 hours. What was Stefan's average speed for the whole trip???

133. ## algebra

An object that is projected straight downward with initial velocity v feet per second travels a distance s vt 16t 2 =+ , where t =time in seconds. If Ramón is standing on a balcony 84 feet above the ground and throws a penny straight down with an initial

134. ## math

what rectangles with whole-centimetre sides have a perimeter of 44cm

135. ## General

Why didn't you guys are answering my questions at all. 8 question posted tomorrow but not even a single question is answered yet.

136. ## Math

Adam wants to compare the fractions 2/5, 1/6, and 1/3. He wants to order them from least to greatest and rewrite them so they all have the same denominator. Explain how Adam can rewrite the fraction.

137. ## Chemistry

how did you get (that's 0.17M x 1/2 = 0.085M)

139. ## statistics

A film alliance used a random sample of 50 U.S. citizens to estimate that the typical American spent 78 hours watching videos and DVDs last year. The standard deviation of this sample was 9 hours. (a) Develop a 95 percent confidence interval for the

140. ## MATH..-HELP ME PLEASE GUYS..THIS DUE TMORROW!!!!..

Suppose tank A consist of 500 liter brine with 500gm salt dissolved in it, whereas in tank B containing 500 liter of water. Water is allowed to enter tank A at a rate of 30 liter/minute, and that mixed solution flow from tank A to tank B at a rate of 40

141. ## algebra

find the vertex of 400-16tsquared

142. ## Math

Compare the areas of two rectangular regions if the length of one rectangular region is double that of the other, and the width is triple that of the other. (Use an algebraic formula.)

143. ## math

Christamas card costs \$0.75 each and postage stamps costs \$0.39 each. If you have \$3.00 only to spend on sending 2 cards to your friends, how much money will be left after sending the cards

144. ## LIFE ORIENTATION

IDENTIFY & DESCRIBE 3 ENVIRONMENTAL HEALTH HAZARDS THAT CAUSE ILL HEALTH, CRISISES & DISASTERS WITHIN A COMMUNITY IN SOUTH AFRICA & GLOBALLY. INCLUDE EVIDENCE THAT IS CURRENT OF THE IDENTIFIED ISSUES. USE GRAPHS, STATISTICS & PICTURES TO SHOW EVIDENCE OF

145. ## Organic Chemistry

How do I make an IR Spectrum of C6H12S2 (Allyl Propyl Disulfide)

146. ## English

What is the adverb and prepositional phrase in the sentence: The plane swooped and circled over the beach?

147. ## English

1. If you give me a piece of rice cake, then I will not eat you. 2. If you give me a rice cake, then I will not eat you. 3. If you give me some rice cake, then I will not eat you. 4. If you give me some rice cakes, then I will not eat you. 5. If you give

148. ## life orientation

environmental health hazards that cause ill health,crises,and or disasters within your community or any other community within south africa and globally

149. ## chemistry

A sample of copper metal containing 7.738*10^24 atoms is drawn into a cylindrical wire with radius r = 0.625 mm . How long must the wire be in meters?

150. ## algebra 1

Solve the rational equation below. 1/x-2+ 2x/(x-2)(x-8)=x/2(x-8)

the equatorial radius of the earth is approximately 3960 miles. suppose a wire is wrapped tightly around the earth at the equator. how much must this wire be lengthened if it is to be strung on 10 feet poles above the ground? (1 mile=5280 feet) delta y=

152. ## physics

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?

153. ## physics

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?

154. ## statistics

0.57 of all college students like the idea of a new curriculum. If we select 88 students (ASSUME INDEPENDENCE), what is the Standard Deviation of (the Probability Distribution that would list the number of students (from 0 to 88) and the probability of

155. ## Chemistry

What is the amount of work produced when 1.0 g of H2O (l) is boiled at atmospheric pressure? Assume the liquid has no volume.

156. ## Science

Need help on this question: Which telescopes out of the ones below collects and focuses on Gamma Rays? Arecibo Chandra Hubble Spitzer Thanks....

157. ## Math

How do you know when you should re write as a mixed number or simplify; for example. 1 1/2 x 23/9= 3/1 x 23/9= 69/18= what is the way to tell if I should simplify or re write as a mixed number?

3ab+2a+5b

159. ## Maths

the figure below shows 3 similar circles that just touch one another.A,Band C are the centres of the circles.If the perimeter of the triangle ABC is 42cm, what is the total area of the unshaded part of the 3 circles. (take pie = 22/7)

160. ## MATHS!!!!

For how many odd positive integers n

161. ## chemistry

platinum metal currently costs \$1700 per troy ounce ( note: this is different than a regular ounce 1 troy ounce =31.1035 g. what would the costs be, in dollars , to purchase enough platinum to form a solid cone with maximum radius 0.750 m ?

162. ## Science....Need Help!!!

I'm doing a project based on the Greenhouse Effect. Things that I need to include: 1) EXPLAINED the greenhouse effect using the big idea of energy transfer. (I need to explain, I've already described. 2) EXPLAINED the causes and LONG-TERM effects

163. ## math

In a(n) _________ , simple interest is added on to the amount borrowed and the total is repaid in equal installments.

164. ## chemistry

the pressure in a 1.0 container is 988 ATM what is the pressure in a 2.56L container? ( use gas laws )

165. ## English

What are the parts of the sentence. example: verb, subject, prepositional phase, linking verb, subject compliment, direct object, indirect object, object compliment. The committee elected George chairman.

166. ## math

They skated 14 miles in 2 hours.if they skated at a constant rate, how many miles did they skate in 1 hour

167. ## physics

How do we represent the graph for a ball which is dropped to the ground and caught when it bounces up again?

168. ## algebra

a rectangle with the corners labled wxyz,has a height of(2b-3). what is the equation for finding the lencth?

169. ## life orientation

describe the lifestyle disease factors that contribute to the disease

170. ## Science....Need Help!!!

I'm doing a project based on the Greenhouse Effect. Things that I need to include: 1) EXPLAINED the greenhouse effect using the big idea of energy transfer. (I need to explain, I've already described. 2) EXPLAINED the causes and LONG-TERM effects

171. ## Statistics

What is the highest z-value for the lowest 10% of observations on the standard normal distribution?

172. ## Algebra

How do you write 5/16 as a percent?

173. ## Statistics

What is the lowest z-value for the highest 2% of observations on the standard normal distribution?

174. ## Statistics

The yearly returns of a stock are normally distributed with a mean of 5.1% and standard deviation of 2.7%. Find the probability of a yearly return being greater than 6%.

175. ## PCR Amplification- Microbiology- Bio

PCR Amplification Question: Should we worry about contamination from our own DNA? What about the DNA from other pathogens?

176. ## Trig

A parabola has its vertex on the graph of the line y=3x+1 and passes through (1,10). If it is the same size,? shape, and direction as the graph of y=3x^2, find the equation (s) of all possible parabolas Thanks!!!

177. ## math

A textbook store sold a combined total of 462 biology and chemistry textbooks in a week. The number of biology textbooks sold was two times the number of chemistry textbooks sold. How many textbooks of each type were sold?

178. ## Chemistry

Why is it necessary to use a buret for measuring standard silver nitrate solutio ( volhard)

179. ## Chemistry

The Fe3+ ion has electronic configuration of d5. if all five electrons are unpaired. what is the spin state? (a) singlet (b) sextet (c)septet (d)Octet (e) none of the above the answer is____ Also Which of the following 1H are most deshielded relative to

180. ## life orientation

Five ways in which the human or environmental problem impacts on the community?

181. ## Life orientation

A clear explanation of how alcoholism is a human factor that may cause ill health,accidents,crises or disaster

182. ## algebra

Andy’s average driving speed for a 4-hour trip was 45 miles per hour. During the first 3 hours he drove 40 miles per hour. What was his average speed for the last hour of his trip?

183. ## microsoft word graded project

how do I create and edit a cover letter

184. ## social studies

what is the largest climate region in north america?

185. ## Algebra

One more... Faye wants to know how tall her school building is. On a sunny day, she measures the shadow of the building to be 6 feet. At the same time, she measures the shadow cast by a 5 foot statue to be 2 feet. How tall is her school building? Thank you

186. ## English

1. In the evenings, Sonya's father cooks dinner. 2. In the evening, Sonya's father cooks dinner. 3. Every evening, Sonya's father cooks dinner. (What is the difference among the three sentences?)

187. ## social studies

how is todays goverment similar to the goverment of the roman republic?

188. ## Chemistry

If 10.5 g of hydrogen, H2, were mixed with 6.51 g of acetylene, C2H2, and allowed to react according to the following equation, what is the theoretical yield of ethane,C2H6 produced.

189. ## English

1. At the dacha, Sony's family grows vegetables like potatoes and tomatoes. 2. At the dacha, Sony's family grows vegetables such as potatoes and tomatoes. 3. At the dacha, Sony's family grows vegetables for example potatoes and tomatoes. (Are the three the

190. ## math

joey planted 2/5 of the garden and jane planted 1/3 what fraction of the garden did they plant

191. ## Chemistry

If 10.5 g of hydrogen, H2, were mixed with 6.51 g of acetylene, C2H2, and allowed to react according to the following equation, what is the theoretical yield of ethane,C2H6 produced? If 7.00g of ethane, C2H6 were recovered at the end of the reaction , what

192. ## Geography

In 10-15 line critically discuss 5 ways in which the environmental problen impacts on the community

193. ## physics

A 2.00-m-long diving board of mass 12.0 kg is 3.00 m above the water. It has two attachments holding it in place. One is located at the very back end of the board, and the other is 25.0 cm away from that end. 1-Assuming that the board has uniform density,

194. ## PS

An advantage of using media resources for researching your topic is: A. you may listen to an expert in the subject area that you are interested in. B. media resources may set you in a direction of research you did not expect. C. watching a television or

195. ## physics

Robin is making a mobile to hang over her baby sister's crib. She purchased four stuffed animals: a teddy bear (16 g), a lamb (18 g), a little pony (22 g) and a bird (15 g). She also purchased three small wooden dowels, each 14 cm long and of mass 7 g, and

196. ## math

Los Angeles is about 385 miles from San Francisco. How far apart would the cities be on a map with a scale of 1 in.=100mi?

20x^2+12x

198. ## Physics

Two trains with 112-Hz horns approach one another. The slower of the two trains has a speed of 26 m/s. What is the speed of the faster train if an observer standing near the tracks between the trains hears a beat frequency of 4.7 Hz? (Express your answer

199. ## bmcc

what is the answer to 2ax+8x-9a-36

15. In the following system of equations, what does x equal? -10x + 4y = -64 -10x - 8y = -112

201. ## Life orentation

Name two institutions /community organizations that are involved in supporting or giving redress to these alcohol abuse .explain how this organizations are involving in providing a safe and healthy enviroment

202. ## math

The perimeter of a paved area being built at a playground is going to be 46 meters. If the length and width are each a whole number of meters, what should the length and width of the area be to cover the greatest possible area?

Compare Mayan civilization to another ancient river valley civilization. Include at least two similarities.

204. ## pre calculus

Find the inverse of the following function. Find the domain, range, and asymptotes of each function. Graph both functions on the same coordinate plane. F(x)= ln(8-x) I am totally lost, somebody please help????

205. ## pre calculus

Environmental Concerns: The spread of oil leaking from a tanker is in the shape of a circle. If the radius r (in feet) of the spread after t hours is r(t) = 200sqrt t, find the area A of the oil slick as a function of the time t. I don't get this at all.

206. ## college algebra

Solve the logarithmic equation. Log x +log2x = 4 Wouldn't this be no solution because log x is undefined?

207. ## physics 1

a helicopter is flying at an altitude of 1000 m above the ground, with a horizontal velocity of 50 m/s, how far from the rally point should the relief package be dropped?

208. ## Chemistry

0.356 grams of an unknown metal reacts with oxygen to form 452 milligrams of the metal oxide. Identify the metal

209. ## Chemistry

Draw the Lewis dot diagram of CO2, how many types of electrons are in the valence bond?

210. ## Life orientation

Identify one environmental or human factor that causes ill health.2 discuss 5(ays in which the human or environmental problem impact on the community.

211. ## Chemistry

What is the pH of a solution of 40.0 ml of 0.800 M HCl titrated with 4.00 ml of 1.00 M Hydroxyl amine?

In the following system of equations, what does x equal? -10x - 2y = 56 6x - 2y = -40 x = 6 or x = -6 or x = 2 or x = -2

213. ## algebra 1

Graph each rational function;identify the domain and ranges;and compare the graph with the graph y=1/x. 1.y=-10/x 2.y=1/(x+3)+3

Two angles of an isosceles triangle are 68∘ and x∘. What is the sum of all the (distinct) possible values of x?

215. ## physics

A standard man climbs 10 m up a vertical rope. How much energy in calories is dissipated as heat in a single climb if 20% of the total energy required is used to do the work?

216. ## algebra 1

Graph each rational function;identify the domain and ranges;and compare the graph with the graph y=1/x. 1.y=-10/x 2.y=1/(x+3)+3

217. ## math

There are 5 options on the dessert menu at a restaurant. Erin and Ellen like all of the choices equally, so they each choose a dessert at random from the menu. What is the probability that Erin will choose apple pie and Ellen will choose strawberry

218. ## math

what if Julie is thinking of an even number between 12 and 29 with digits whose difference is 7? what is the number?

219. ## Physics, Help me please,

What is the potential difference between Points A and B? E=100N/C AB=.2M degrees of 30

One of the best networking traits you can develop is

221. ## math

A bag contains 5 red balls and 7 green balls . A ball is picked at random , its color is noted and it is given out . The bag is shaken and a second selection is made. A. Draw. Tree diagram to illustrate thr information. B. Calculate the probability that

222. ## Math

How much 40% Nacl (Fw 58.44) would you need to make 2.5L of a 5% Nacl solution?

223. ## Physics

A space station is constructed in the shape of a hollow ring of mass 5.60 104 kg. Members of the crew walk on a deck formed by the inner surface of the outer cylindrical wall of the ring, with radius 140 m. At rest when constructed, the ring is set

224. ## chemistry

A 33.0g sample of nitrogen, N2 has a volume of 42.0L and a pressure of 640.mmHg. What is the temperature, in kelvins and degrees Celsius, of the gas?

225. ## Physics

A drawbridge with a weight of 5000 N is supported by a hinge and rope and is in static equilibrium. The length of the drawbridge is 5 m and the rope is attached to the draw bridge a distance of 4 m from the hinge. What is the tension force rope provides?

226. ## Physical science

A ball is thrown up at 8m.s from the roof which is 60m high.it strikes the balcony below after 4s.the ball then bounces off the balcony and strikes the ground.ignore the effects of friction.calculate magnitude of the velocity at which the ball strike the

227. ## algebra

if ne person can do 25 sqare feet in 4 hours and another in 5 hours how much concrete can they do working together in 8 hours\ \ \

228. ## physics

A man pushes a lawn mower on a level lawn with a force of 193 N. If 39% of this force is directed downward, how much power does he expend in pushing the mower 4.9 m in 12 s?

229. ## Math 2

Last one I promise. I'm having trouble with these. Express in terms of logarithms of x, y, z, or w. ln 4th root (x^6/(y^2 z)) Write the expression as one logarithm. ln y^4 + (1/3) ln(x^9 y^9) − 7 ln y

230. ## English

Cuba is one of the few remaining communist countries in the world. Since the collapse of the Soviet Bloc in 1990, however, the country has promoted capitalism in the form of tourism in order to stimulate the economy. is this sentence correct?? help me????

231. ## Math

A gerbil in a maze has 6 places at which to turn left or right.How many different ways can the gerbil get through the maze?

232. ## chemistery

you have 2.00kg of KCL dissolved in 0.600L of H2O what is the percent solution of KCL(w/v)?

233. ## Science..physics

The moon is the Earth's nearest neighbour in space. The radius of the moon is approximately one quarter of the Earth's radius, and its mass is one eightieth of the Earth's mass. a) Culculate the weight of a man with a mass of 80kg on the surface of the

234. ## math

I cooked 1/2 of greens today and 1/3 of greens yesterday. How much greens did I cook.

235. ## Medical Terminology

Making use of the following terms, write a fictitious medical report of about two paragraphs describing a dermatologic condition or disease. Focus the report on the onset, progression, location, and etiology of the condition or disease, and the treatment

236. ## Algebra 2.....

Simplify. -3x^2( 6xy- 2x^3 y^2 z)

237. ## Life oreintation

In 150 words discuss ways in which one can take responsibility to provide safe and healthy living environment

238. ## Calculus

Part I The change in annual revenue in thousands of dollars for the Ozark Zip Line Corporation has been modeled by the function. R(x) = 8.2x^2 + 23.1x where x is the number of years after 2000. To find the total revenue gained between the years 2002 and

239. ## Algebra

(x^3+2x^2-4x-8)/(x^4-16)x(3x^2+8x+5)/3x^2+11x+10)

240. ## trignometry

In the right triangle shown below, the length of AB is 8 units, ¡ÏA measures 60¡ã, sin 60¡ã ¡Ö 0.866, cos 60¡ã ¡Ö 0.5, and tan 60¡ã ¡Ö 1.73. Approximately how many units long is BC , to the nearest hundredth of a unit? A. 4.00

241. ## finance

templeton extended care facilities inc is considering the acquisition of a chain of cemeteries for \$450 million. since the primary asset of this business is real estate, templeton's mangement has determined theat they will be able to borrow the majority of

242. ## chemistry

interpret the following balanced equation into Particles, Moles, Mass: 2Al+3CuSO4== AL2(SO4)3+ 3Cu

243. ## statistics

Your mail-order company advertises that it ships 95% of its orders within three working days. You select an SRS of 100 of the 5000 orders received in the past week for an audit. The audit reveals that only 91 of these orders were shipped on time. A) What

244. ## Maths

John has some sweets to give to his friends. If he gives 4 sweets to his friends, he will need 2 more sweets. If he gives 7 sweets to each friend, he will need 17 sweets. How many friends does John have? How many sweets does John have?

245. ## ECON

Explain why other income and output measures are used to express the performance of the economy in addition to GDP.

246. ## statistikc

We want a confidence interval for the mean IQ of all the 7th grade girls in that school district. We do not know the population standard deviation so we use the confidence interval that uses the t. In order to use the t-interval we need to assume that the

247. ## Afrikaans

An oral about different instruments,oral in Afrikaans.

248. ## life orientation

in 10-15 lines critically discuss 5 ways in which yhe tsunami problems impacts on the community