# Andrea

Newest questions and responses by Andrea
1. ## history

What is the meaning of true expression? Please help ASAP!!! I can't find the definition anywhere!!! :(

3. ## math

The height h of an object projected upward from the floor of the Golden Gate Bridge which has an initial height of 220 feet and with an initial velocity of 30 feet per second is given by h=-16t^2+30t+220. How many seconds later will the rock hit the water?

5. ## math

Graph the system of linear inequalities: y+3x=0,y

Solve x-7

7. ## math

A car traveled 243 miles on a trip. During 63 miles of the trip, the car traveled through the city and had gas mileage that was 9 fewer miles per gallon that the gas mileage on the highway. If the total amount of gasoline used for the trip was 9 gallons,

8. ## math

Two pipes can be used to fill a pool. Working together, the two pipes can fill the pool in 2 hours. The larger pipe can fill the pool in 3 hours less time than the smaller pipe can alone. Find the time to the nearest tenth of an hour it takes for the

9. ## math

Because of the increase in traffic between Springfield and Orangeville, a new road was built to connect the two towns. The old road goes south x miles from Springfield to Freeport and then goes east x + 5 miles from Freeport to Orangeville. The new road is

10. ## history

What would be a good legal question for the case Board of Education v. Earls case and a good answer for the question? This is suppose to be for my homework and it is due tomorrow! I need help immediately so I need to know an answer right now. :(

11. ## math

An isosceles right triangle has legs of equal length. If the hypotenuse is 22 inches long, find the length of each leg. Please help me on this problem so bad!!! I NEED AN ANSWER TO THIS PROBLEM IMMEDIATELY!!!! :(

13. ## math

The radius of a moon is 747 miles. use the formula for the radius r of a sphere given it's surface area A, r=√(A/4π) , to find the surface area of the moon. Please help ASAP!!!!! :(

14. ## math

A balloon is secured to rope that is staked to the ground. A breeze blows the balloon so that the rope is taut while the balloon is directly above a flag pole that is 60 feet from where the rope is staked down. Find the altitude of the balloon if the rope

15. ## math

What is the approximate distance between the pair of points (5,4) and (14,16)? Please help ASAP!!!! :( I only know that the exact distance between the pair of points (5,4) and (14,16) is 15 units!!!

17. ## math

6 divided by the difference of a number and 2, minus 5 divided by a number plus 2, equals 5 times the reciprocal of the difference of the number squared and 4. What is the number? Please help ASAP!!!!!!!!! :(

18. ## math

The volume of a cone varies jointly as the square of its radius and its height. If the volume of a cone is 2 pi cubic inches when the radius is 1 inch and the height is 6 inches, find the volume of a cone when the radius is 5 inches and the height is 3

19. ## math

If A={x|x is an odd integer} and B={9,11,12,14} list the elements of A n B. So find the intersection of A and B. Please helpppppp!!!!!!! :(

20. ## math

The function A(r)=πr^2 may be used to find the area of a circle with radius r. Find the area of a circle whose radius is 11 centimeters.

21. ## math

Write in standard form when given 2 points on a line (-3,-5) and (0,-7) Please helpppppppp!!!!!!!!!!! :(

22. ## history

In “The Raven and the First Men: The Beginnings of the Haida,” which evidence best helps the reader infer that the Haida might find it acceptable behavior to play tricks on one another?

23. ## Math

Tony is 56 years younger than stacy 4 years ago stacy age was 3 times tony. How old is tony now

24. ## Math

Andres is 6 years older than kylie. In 8 years the sum of their ages will be 88. How old is andres now

26. ## Math

The length of the rectangle is 7/(x-4) feet, while its width is 5/x feet. Find its perimeter. Please helppppp!!!!!!! :(

27. ## social studies

how would you compare and contrast the Virginia and New Jersey Plans.

29. ## History

What were 3 key causes of the American Revolution:

30. ## History

During the American Revolution what was the role of Thomas Paine’s Common Sense in promoting the movement for independence

31. ## History

What was George Washington's fundamental beliefs about life and what was Thomas Jeffersons.

32. ## History

what motivated Thomas Jefferson?

33. ## history

why might Leonard believe that democracy would inevitably degenerate into tumult, violence, and anarchy

34. ## History

Which type of government did Daniel Leonard prefer?

35. ## Science

A student measures the volume of a liquid and finds it to be 40ml. How many significant figures are in the measurement ? Really confused can someone help me out ?

36. ## Math

Rewrite in rectangular form: r=6 cos theta I got (x-3)^2+y^2=6

37. ## Math

How would you show that one trigonometric expression is equal to another? I’m not exactly sure how to start.

38. ## Chem

What is the pKb of Formate ion? 0.64M ........... 8.77 pH Help!! I'm not sure how to calculate this... I know to use the Kb formula but I'm not sure where to plug the numbers in.

39. ## Chemistry

I am given the following information: Lactic acid................0.025M...................pH 2.74 How do I calculate the pKa? I don't know how to do it without the concentration. Help please!

40. ## Math

On his last four tests, Danib scored 55%, 78%, 84% and 93%. What score should he get on his next text so that his average on all five tests are 80%?

41. ## Chemistry

If you had an acetic acid solution that was 0.10 M, what would the acetate concentration have to be in order to get a pH of 5.35? I tried doing [H+] = 10^(-pH), but I don't think that's right. Please help, I'm stuck.

42. ## AP Chem

Please! This is urgent! I don't know how to do this. Determine the solubility at 25°C of Cd(IO3)2 in water and in 0.20 M CdCl2. Ksp of Cd(IO 3) 2 is 2.5 × 10 –8 at 25°C. Please help!

43. ## math

The formula for the lateral surface area of a cone is A=πr√(h^2+r^2). (A)Solve for r and simplify the result, if possible. (B) If the lateral surface area of a cone is 10 square feet and the height is 16 inches, what is the radius of the cone in inches?

44. ## math

The formula for the surface area of a cylinder is A=2πr^2+2πrh. (A)Solve for r and simplify the result, if possible. (B) If the surface area of a cylinder is 100 square feet and the height is 40 inches, what is the radius of the cylinder in units of

45. ## math

The projected number N of Wi-Fi enabled cell phones (in millions) in the U.S. can be modeled by the function N=-0.4x^2+21x+35, where x is the number of years since 2009. If the trend continues, find the year in which the projected number of Wi-Fi enabled

46. ## math

Suppose that the position y (feet) of a projectile above the ground is described by the equation y=-16t^2+70t+2, where t is the time elapsed (seconds) since the object was launched. (A) What is the initial position of the object? (B) When will the object

47. ## math

(A)Write the equation in standard form and calculate its discriminant. (B)Solve the equation by using the quadratic formula. (C)After solving the equation, write it in factored form. 7x(x-2)+2(x+4)=3 Please help!!!!! :(

49. ## math

(A)Write the equation in standard form and calculate its discriminant. (B)Solve the equation by using the quadratic formula. (C)After solving the equation, write it in factored form. 0=8+4t-t^2 Please help!!!!! :(

50. ## math

(A)Write the equation in standard form and calculate its discriminant. (B)Solve the equation by using the quadratic formula. (C)After solving the equation, write it in factored form. 1/8x^2=x-5/2 Please help!!!!! :(

51. ## math

Solve the equation by completing the square. If the solutions are real, give exact and approximate answers. Otherwise, list the exact solutions. 7x^2-4x+1=2x^2-7x+3 Please help!!!!! :(

52. ## math

Solve the equation by completing the square. If the solutions are real, give exact and approximate answers. Otherwise, list the exact solutions. 12x=-3x^2-14 Please help!!!!! :(

53. ## math

Solve the equation by completing the square. If the solutions are real, give exact and approximate answers. Otherwise, list the exact solutions. 2y^2=-12y-3 Please help!!!!!!:(

59. ## math

The volume of a sphere depends on the sphere's radius:V=4/3πr^3.(A)If the radius of a sphere is 3 feet,what is the volume?Give exact and approximate answers and use correct units.(B)Solve for r in the volume formula.(C)If the volume of a sphere is 20

60. ## math

The volume of a sphere of radius r is V=4/3πr^3.Solve for r.

61. ## math

what is the radius of such a cone whose volume is 5π?

62. ## math

The marketing department of a textbook publisher finds that the demand for a book is related to the price according to the formula p=40-√(0.0001x+1),where x is the quantity of books sold (that is,the quantity demanded by the market) at price p.(A)If the

63. ## math

Police departments estimate the speed of a car when they are given the distance that it skidded before coming to a stop. if the road surface is wet concrete, the function s(x)=√10.5x is used, where x is the skidded distance in feet and s(x) is the speed

64. ## Science

Why is Mercury a hazard in the environment?

65. ## Science

Briefly describe Pretreatment, Primary Treatment and Secondary Treatment for municipal wastewater.

66. ## Science

Describe 3 air pollutants and the troposphere to include the effects of the pollutants on the environment.

67. ## Science

Describe 2 events in human history and in what way the events allowed human populations to grow and thrive.

68. ## math

Determine whether the equalities are true or false. 1.√2 /2=√(10 /20) 2.√11 /24=24/√11 3.2/∛3=(2/√9)/3 4.1/√2 =√2 /2

69. ## math

change the radical √(3/8) into simplest form a/b sqrt(c)

70. ## math

Rationalize the denominator and simplify if possible. √5+√3 / √5-√3

71. ## math

Multiply and Simplify.(∛x +2)(∛(x^2)-2∛x +4) Pleaseeeeee helpppppp!!!!!!! :(

72. ## math

Find an equation of the circle with center at (-9,2) and passing through (2,-2) in the form of (x-A)^2+(y-B)^2=C where A,B,C are constant. Pleaseeeeee helpppppp!!!!!!!!

74. ## math

Find an equation of the circle with center at the origin and passing through (2,-5) in the form of (x-A)^2+(y-B)^2=C where A,B,C are constant.

75. ## math

State and prove the Pythagorean Theorem.

76. ## math

The cookie dough used by a bakery to make 2-ounce cookies contains an average of 32 raisins per pound of dough. the bakery sells cookies in bags of a dozen. suppose that customers complain if one or more of the cookies in a bag contains no raisins. over

77. ## math

Carla the baker worked four hours to make cookies. She ended with 380 cookies altogether. Write an equation to express how many cookies Carla made each hour.

78. ## math

If (-4,-2) and (2,6) are opposite points on a circle, what is the equation of the circle?

79. ## math

How do you solve this expression \sqrt[8]{v^{40}}!!! So basically it's v^40 divided by 8!!! When I typed v^5 on my homework it said that it was incorrect!!! I want to know what I did wrong!!! Pleaseeeeeeee helpppppppp!!! :(

80. ## math

Find the body surface area of a person who is 5 feet,4 inches tall and who weighs 107 pounds. Round your answer to the nearest hundredth. Use the Mosteller formula to calculate adult body surface area. Please helppppppppppppp!!!!!!! :(

81. ## Math

factor x^2/7 out of the expression x^5/7-x^2/7

82. ## Math

How do you write 8x^2 in radical form?

83. ## Math

Use algebra for 5.235235235... and 3.9999999... Also write these numbers as a fraction not a mixed number. How do I do this?

84. ## Math

Which expression or expressions are equivalent to 3^n/2^n?

85. ## Math

how do you write 225 1/2 using radical notation?

86. ## Math

|(-3x+9)/x^10| (Factor -3 out of the numerator first)

87. ## Math

the length of a cut board in a sawmill should be within 2% of the board's stated length.write an absolute value inequality that describes the length L of an acceptable board with a stated length of 12 feet.

88. ## AP Chem

A first-order reaction has a rate constant of 0.547 min - 1. How long will it take a reactant concentration 0.14 M to decrease to 0.07 M? Not sure how to do this!

89. ## Math

In a certain city, the temperature normally ranges from 20 degrees Fahrenheit and 80 degrees Fahrenheit. Write a compound inequality that describes abnormal temperature ranges for this city and then convert that inequality to degrees Celsius. F=9/5C+32

90. ## Math

The volume of a cylinder varies jointly as the height of the cylinder and the square of its radius. If the height is halved and the radius is doubled, determine the effect on the volume.

91. ## AP Chem

Which of the following conditions would most likely affect the rate of a chemical reaction? A. Increasing the number of reaction steps B. Decreasing the size of the reaction vessel C. Increasing the concentration of reactants D. Decreasing the amount of

92. ## Math

the stopping distance of an automobile is directly proportional to the square of its speed v. a car required 90 feet to stop when its speed was 70 miles per hour. find a mathematical model that gives the stopping distance d in terms of its speed v. D=

93. ## Math

when an aircraft takes off, it accelerates until it reaches its takeoff speed V.In doing so it uses up a distance R of the runway, where R is proportional to the square of the of the takeoff speed. If V is measured in miles per hour and R is measured in

94. ## Math

Suppose A is directly proportional to the square of B,and A=45 when B=3. a)Find the constant of proportionality b)Write the formula for A in terms of B c)Use your formula to find A when B=6

95. ## AP Chem

Which molecule has the strongest intermolecular forces? A. HOCH2CH2CH2OH B. CH3CH2CH2OH C. CH3CH2CH2CH3 D. HOCH2CHOHCHOHCH2OH I'm pretty sure it's C.

96. ## AP Chemistry

When does absorption occur in infrared spectroscopy? A. When the frequency of the infrared radiation is the same as the rotational frequency of the bond B. When the frequency of the infrared radiation is less than the frequency of the bond C. When the

97. ## AP Chemistry

Which of the following bonds is the most polar? A. C-F B. C-C C. C-O D. C-N I was originally going to pick C-F because F is the most electronegative, but I'm not so sure. Help?

98. ## biology

When a chromosome from one parent has a corresponding copy from the other parent, these chromosomes are said to be