# Posts by Andrea

Total # Posts: 962

no

Thank you :)
3. ### Math

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

Okay, thank you Steve!
5. ### Math

How would you show that one trigonometric expression is equal to another? I’m not exactly sure how to start.
6. ### 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.
7. ### Chemistry

Thank you so much!!!
8. ### 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!
9. ### 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%?
10. ### Chemistry

So the concentration would be [H+] = 4.47?
11. ### 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.
12. ### 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!
13. ### math

The formula for the lateral surface area of a cone is A=?r?(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? Round your answer to ...
14. ### math

The formula for the surface area of a cylinder is A=2?r^2+2?rh. (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 feet? Round your answer to ...
15. ### 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 cell phones will first...
16. ### 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 strike the ground? ...
17. ### 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!!!!! :(
18. ### math

Solve the quadratic equation (2x+3)(x-3)=7. If there is more than one correct answer, enter your answers as comma separated list. If there are no real solutions,enter none. Please help!!!!! :(
19. ### math

Maybe I have to switch sides so it might be t^2-4t+8=0. Please help me more!!!! :(
20. ### 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!!!!! :(
21. ### 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!!!!! :(
22. ### 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!!!!! :(
23. ### 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!!!!! :(
24. ### 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!!!!!!:(
25. ### math

Evaluate the expression?(-6)/(?(-3) ?(-4)) and write the result in the form a+bi. Please help!!!!! :(

27. ### math

The volume of a cone of radius r and height h is V=1/3?r^2h.Solve for r. Please help me!:(
28. ### math

The volume of a cylinder of radius r and height h is V=?r^2h.Solve for r. Please helppppp!!!!
29. ### math

The area of a circle of radius r is A=?r^2.Solve for r. Please help!!!!!!!
30. ### math

The volume of a sphere depends on the sphere's radius:V=4/3?r^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 cubic inches,what is ...
31. ### math

The volume of a sphere of radius r is V=4/3?r^3.Solve for r.
32. ### math

Just a cone!So the volume of the cone of height 2 and radius r is V=2/3 ?r^2!I need to find the radius of the cone whose volume is 5?!Can you please help me?
33. ### math

what is the radius of such a cone whose volume is 5??
34. ### 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 demand is 1,000,000 ...
35. ### 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 of the car in miles per...
36. ### Science

Why is Mercury a hazard in the environment?
37. ### Science

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

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

Describe 2 events in human history and in what way the events allowed human populations to grow and thrive.
40. ### 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
41. ### math

change the radical ?(3/8) into simplest form a/b sqrt(c)
42. ### math

Rationalize the denominator and simplify if possible. ?5+?3 / ?5-?3
43. ### math

Multiply and Simplify.(?x +2)(?(x^2)-2?x +4) Pleaseeeeee helpppppp!!!!!!! :(
44. ### english

1. D 2. C 3. C. 4. B 5. A
45. ### 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!!!!!!!!
46. ### math

what is the distance between (-5,0) and (-9,11)? Please helpppppp!!!
47. ### 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.
48. ### math

State and prove the Pythagorean Theorem.
49. ### 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 the long run, about ...
50. ### 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.
51. ### math

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

I'm taking the square root of the whole thing!!! The problem is suppose to look something like this 8^?v^40!!! So 40 is inside of the square root thing and 8 is outside of the square root thing.
53. ### 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!!! :(
54. ### 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!!!!!!! :(
55. ### Math

factor x^2/7 out of the expression x^5/7-x^2/7
56. ### Math

How do you write 8x^2 in radical form?
57. ### Math

Anonymous is correct 5/5
58. ### 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?
59. ### Math

Which expression or expressions are equivalent to 3^n/2^n?
60. ### Math

how do you write 225 1/2 using radical notation?
61. ### Math

|(-3x+9)/x^10| (Factor -3 out of the numerator first)
62. ### 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.
63. ### 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!
64. ### 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
65. ### 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.
66. ### 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 air in the reaction ...
67. ### 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= Estimate the stopping ...
68. ### 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 feet, then 0.1639 is ...
69. ### 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
70. ### AP Chem

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

thanks!!
72. ### 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 frequency of the infrared...
73. ### 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?
74. ### biology

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

The internal diameter of a spherical bowl half full is 20cm. The contents is poured into an empty cylindrical bottle with internal diameter 10cm. Calculate correct to one decimal places the depth of water in the bottle
76. ### Chemistry

How do I write 96.67673716 with its standard deviation 2.132575 to the correct number of sig figs?
77. ### Math

A sports store has 116 soccer balls. Over 6 months , it sells 8 soccer balls per month . How many soccer balls are in inventory at the end of the 6 months?
78. ### Linguistics

I am reposting this because I did not receive an answer and am still stuck. (a) The lexicon and phrase structure grammar cannot provide hierarchical structures (i.e., trees) for sentences such as the following: -A lion escaped from the zoo yesterday. -An eagle flew away ...
79. ### Language Arts 8 A

Fix your Rough Draft with necessary corrections and that is your final draft.
80. ### Linguistics

I do not know
81. ### Linguistics

For each of the following sentences, indicate whether it has a complete hierarchical structure according to the revised lexicon and grammar (yes/no). -A cute lion escaped from the zoo yesterday. -An cute lion escaped from the zoo yesterday. -A gray eagle flew away quickly. -An...
82. ### Linguistics

What are three different ways an English speaker might make the borrowed Polish place name Szczebrzeszynie[?t??b??????]fit within English phonotactics?
83. ### History

Explain how Hobbes and Locke influenced the social and political landscape of Europe and the Americas.
84. ### science

what is the substrate for primase ?
85. ### Math

Luis had 8/10 meter of wood for the frame thqt he is doing. His father gave him 1/4 meter more.How many meters of wood that he have now?
86. ### science

what is the substrate for primase ?
87. ### science

how can you differentiate a peptide bond and covalent bond and wher will you find the covalent bond ?
88. ### Biology

Why is it important for hydrogen bonds to be weak? -i already tried googling it but im still confused
89. ### Biology

why does h2o have such attractive forces
90. ### Biology

Why is it important for hydrogen bonds to be weak? -i already tried googling it but im still confused
91. ### Math

The value number for 4,600,028
92. ### physics

a skydiver has amass of 140 kg.at what speed will she have a momentum of 10,000 kg m/s?
93. ### history

Both Eleanor and Louis were to closely related for the church to tolerate
94. ### history

what was the relationship between politics and religion in medieval Europe.
95. ### math

To determine whether there is a relationship between the type of school attended and verbal reasoning scores for Irish students, three samples with 25 students, in each group, were randomly selected from data used by Raferty and Hout (1985). One group of students attended ...
96. ### math

what is the rate of change of the function y=3
97. ### Book comphrension

In the book thief, how is Liesel Meminger affected by the war?
98. ### Book comphrension

In the book thief, how is Liesel Meminger affected by the war?

36
100. ### physics

a 5.4 kg ball slides along a friction-less, horizontal surface at 6.2 m/s. The ball then encounters a ramp which slopes upward. The ball slides up the ramp, slowing down until it stops and slides back down. what is the kinetic energy of the ball as it slides along the friction...