# Questions Asked onAugust 19, 2010

1. ## physics

A 0.060 kg tennis ball, moving with a speed 2.50 m/s, collides head on with a 0.090kg ball initially moving away from it at a speed of 1.15 m/s. Assuming a perfectly elastic collision, what are the speed and direction of each ball after the collision?

asked by joy
2. ## The elements and Principles of Design

CAN SOMEONE PLEASE CHECK MY ANSWERS. (MY ANSWERS ARE AT THE BOTTOM...) 1. Which one of the following factors is one of the principles of design? A. Form C. Pattern B. Color D. Balance 2. Of the following expressions, which best describes the concept of

asked by Anonymous
3. ## college physics

A 0.25 kg skeet (clay target) is fired at an angle of 30 degrees to the horizon with a speed of 25 m/s. When it reaches the maximum height, it is hit from below by a 15 g pellet travelling upward at a speed of 200 m/s. The pellet is embedded in the skeet.

asked by jen
4. ## physics

A spring with k = 53 N/m hangs vertically next to the 15 cm mark on the ruler. If a 2.5 kg mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks

asked by kathy
5. ## statistics

Given the following scatter diagram , the sample correlation coefficient r: Has a positive linear correlation Has a negative linear correlation. Has little or no correlation. Looks close to + 1.00

asked by Karen
6. ## Math Calculus

Three sides of a fence and an existing wall form a rectangular enclosure. The total length of a fence used for the three sides is 240 ft. Let x be the length of two sides perpendicular to the wall as shown. Write an equation of area A of the enclosure as a

asked by Livia
7. ## physics

[20 pts] A 2.00 kg block is pushed against a spring with negligible mass and force constant k = 400 N/m, compressing it 0.220 m. When the block is released, it moves along a frictionless, horizontal surface and then up a frictionless incline with slope 37

asked by joy
8. ## physics

You drop a ball from a height of 2.0 m and it bounces back to a height of 1.5 m (a) What fraction of its initial energy is lost during the bounce? (b) What is the ball’s speed just at it leaves the ground after the bounce?

asked by jen
9. ## Math

Question: A tunnel with a parabolic arch is 12 m wide. If the height of the arch 4 m from the left edge is 6 m, can a truck that is 5 m tall and 3.5 m wide pass through the tunnel? Justify your decision. I drew the graph of the arch with x-intercepts (0,0)

asked by Emily
10. ## chemistry

When 10.0 mL of 0.012 M Pb(No3)2 is mixed with 10.0 mL of 0.030M KI, a yellow precipitate of PbI2(s) forms. a. Calculate the molarity of [Pb2+] b. calculate the initial molarity of [I-] c. On measuring the equilibrium concentration of [I-] it cam out to be

asked by Anonymous
11. ## chemistry

what mass of a 15% (m/m) NaOH solution contains 125 grams NaOH?

asked by Anonymous
12. ## Programming

Submit pseudocode and a flowchart for the following programming exercise: Fat Gram Calculator Design a program that asks for the number of fat grams and calories in a food item. Validate the input as follows: - Make sure the number of fat grams and

asked by johnny
13. ## Algebra 2

HELP!!! 1. Having a x-intercept of -4 and parallel to the y-axis. How do i write this equation in standard form?

asked by Jessica
14. ## physics

A 0.25 kg skeet (clay target) is fired at an angle of 30 degrees to the horizon with a speed of 25 m/s. When it reaches the maximum height, it is hit from below by a 15 g pellet travelling upward at a speed of 200 m/s. The pellet is embedded in the skeet.

asked by joy
15. ## math

graph the equation by plotting the points: 35-5y=0 i know how to put the solutions on the graph. i am stuck on this equation. i think x=0 but i can not figure for y. please help me and show me the steps to solve this.

asked by barb
16. ## science

Geologists have divided the history of the earth into four different eras. Which era below is not one of the four? a) Mesozoic Era b) Cenozoic Era c) Precambrian Era d) Stone Era e) Paleozoic Era Just need to know if my answer or right or wrong. Thanks! :)

asked by ant
17. ## Physics - Projectile Motion

While Hiking in the wilderness, you come to the top of a cliff that is 60.0m high. you throw a stone from the cliff, giving it an initial velocity of 21m/s at 35deg above the horizontal. How far from the base of the cliff does the stone land? (85m) I tried

asked by Shaila
18. ## Math

Choose the one alternative that best completes the statement or answers the question. Solve the problem. Assume that simple interest is being calculated in each case. Round your answer to the nearest cent. Martin takes out a simple-interest loan at 7.5 %.

asked by Alex
19. ## physics

A 0.25 kg skeet (clay target) is fired at an angle of 30 degrees to the horizon with a speed of 25 m/s. When it reaches the maximum height, it is hit from below by a 15 g pellet travelling upward at a speed of 200 m/s. The pellet is embedded in the skeet.

asked by riley
20. ## science

ka value for acetic acid,aluminium nitrate,zinc nitrate,ammonium nitrate and sodium dihydrogen phosphate?

asked by cf september
21. ## Math

A hemispherical bowl with a 30-cm radius has some water in it. The water is 15 cm deep. Find the volume of water, to the nearest cubic cm.

asked by John
22. ## Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

asked by Anonymous
23. ## Chemistry

To balance the oxygen and hydrogen for a redox reaction that takes place in acidic solution, it is necessary to use which of the following?A. H2O and H+ B. H2O only C. H2O and OH- D. OH- only

asked by Jarred
24. ## US History: Ms. Sue

"The Interstate Commerce Act of 1887, establishing the Interstate Commerce Commission (ICC) had been an early effort to regulate the industry; but over the years, the courts had sharply limited its influence." - wiki Would the Interstate Commerce Act be

asked by Amy~
25. ## English

I need some help with picking out adjectives and adverbs in these movie review examples. 'Toy Story 3': Alternately affecting, hilarious and heartbreaking and the most original prison-escape movie ever made. A worthy finale to a fantastic franchise. It's

asked by confused by adverbs and adjectives
26. ## math

how do you find sin7x/4x when lim x goes to 0 the answer is 7/4

asked by Jin
27. ## SCIENCE

The earth revolves around the sun, and the moon revolves around the earth. The moon is held in orbit by the earth's_________. a) regression b) revolution c) gravity d) resolution Just need to know if my answer or right or wrong. Thanks! :) C

asked by ant
28. ## math

A leaky faucet fills a 100 millimeter cup in 10 minutes. 1.how much water is wasted in a day?a week?a non leap year? 2.How long does it take to waste a kiloliter of water? (hint:1 kiloliter=1000000 milliliters)

asked by bryce
29. ## Physics

A 8.1 kg stone is at rest on a spring. The spring is compressed 12 cm by the stone. The stone is then pushed down an additional 27 cm and released. To what maximum height (in cm) does the stone rise from that position?

asked by Liz
30. ## Chemistry

What would happen if you insert an iron nail in the zinc nitrate solution? Explain and write the reactions that take place.

asked by Anonymous
31. ## college

Construct a frequency distribution table for the following scores. Include columns for proportion and percentage in the table. Scores: 5, 7, 8, 4, 7, 9, 6, 6, 5, 3 9, 6, 4, 7, 7, 8, 6, 7, 8, 5

asked by Kelly
32. ## math

The rent-a-stall horse barn has stalls for 1000 horses. Forty percent of the stalls are for ponies. On Tuesday, there were 200 ponies and a bunch of quarter horses at the horse barn. The horse barn was 75 percent full. hOW MANY QUARTER HORSES WERE IN THE

asked by tom bleyu
33. ## Algebra I

Two airplanes start at the same time and fly toward each other from points 1000 km apart at rates of 420 km/h and 330 km/m . After how many hours will they meet?

asked by stephaine
34. ## math

I have 10 boxes and 44 marbles .Can I put my marbles in the boxes so that each box contains a different number of marbles?

asked by karen
35. ## Physics

How much energy is need to place four positive charges, each of magnitude +5.0 mC, at the vertices of a square of side 2.5 cm?

asked by Anonymous
36. ## Math

(a) A sphere of radius 4 in is inscribed in a cone with radius 6 in. How tall is the cone? (b) A cone with radius 4 in is inscribed in a sphere of radius 6 in. How tall is the cone? Show that there is more than one answer to this question.

asked by John
37. ## Statistics

Assume the body temperature of healthy adults are normally distributed with a mean of 98.2F and a standard deviation of 0.62F. If you have a body temperature of 99.00F, what is your percentile score? Convert 99.00F to a standard score(or a z-score). Is a

asked by Lindsy
38. ## 5th grade

Well,I have a science question it says :If you have 3 liters of air in your lungs and 2/10 of that is oxygen,how many milliliters of oxygen are in your lungs?

asked by peri
39. ## internationa business operations management

As the production manager for an electronic circuit company you have encountered the following situation. Part 1 A process for producing electronic circuits has achieved very high yield levels. An average of only 10 defective parts per million is currently

asked by lisette
40. ## Physics - Projectile Motion

During baseball practice, you go up into the bleachers to retrieve a ball. You throw the ball back into the playing field at an angle of 42deg above the horizontal, giving it an initial velocity of 15m/s. If the ball is 5.3m above the level of the playing

asked by Shaila
41. ## math

what is the sixth term in this sequence 83,77,71,65

asked by isabel
42. ## Psychology

• Find a peer reviewed article which discusses the effects of optimism on physical and psychological health. • Write a 1400 to 1600-word paper summarizing the article and stating your opinion on the validity of the study or studies.

asked by dave
43. ## Chemistry

What would happen if you insert an iron nail in the copper solution? Explain and write the reactions that take place.

asked by Anonymous
44. ## Math

The points (2, 3,6) and (6, 3, !2) both lie on the sphere x 2 + y 2 + z 2 = 49. What is the shortest path between them if travel is restricted to the surface of the sphere?

asked by John
45. ## science

________ is the study of the earth. Just need to know if my answer or right or wrong. Thanks! :) Geology (Earth Science)

asked by ant
46. ## statistics

using the 68- 95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard diviation of 20. Use the 68-95-99.7 rult to find the following quantities: percentage of scores less than 100 relative frequency of

asked by margaret
47. ## Physics

A uniform magnetic field of B = 3x10−4 T points in the positive x direction. A charge of 6 μC is fixed at the origin and a charge of −3μC is fixed at (2,0) on the x axis. A charge of 4 μC travels on the y axis at 5.0 x 106 m/s. Neglecting gravity,

asked by thegame
48. ## MATH

An experiment has three possible outcomes: A, B,and C. If P(A)=P(B) and P(C)=2P(A) what is the probability of each event

asked by Anonymous
49. ## science

In 1912, Alfred Wegener discovered and explained the movement of continents, a theory he called"_____." a) plate movement b) continental drift c) moving continents d) shifting plates Just need to know if my answer or right or wrong. Thanks! :) b

asked by ant
50. ## math

Figure is triangle c is biggest side, a and b are same size 19. In figure-4, compute c if a = 3 and b = 2. 20. In figure-4, compute b assuming 27a= and c =2b. ()

asked by Anonymous
51. ## calculus

f(x) = (x+2)/(x+6) What is f^(-1)(-6)? (what is f inverse of -6) I found f' which was [(x+6)-(x+2)]/(x+6)^2 I set the function equal to -6 and found x to be -30/7. Used the formula to find inverse function: 1/f'(f^(-1)(-6)) So I replaced f^(-1)(-6) with

asked by Pegs
52. ## Chemistry

Under the symbol 2so3 is that the same as 2 molecules of so3?

asked by cathrine
53. ## english/reading.

I can't find an actual summary of the picture bride by yoshiko uchida. All that comes up are sites with little excerpts of summarys and if you want more of it you have to pay. Can someone please help me?

asked by stacy.
54. ## science

The deepest layers of the earth is called the inner______. Just need to know if my answer or right or wrong. Thanks! :) Inner core.

asked by ant
55. ## math

the speed of a train a is 6 mph slower than the speed of train b. train a travels 220 miles in the same time it takes train b to travel 250 miles. find the speed of each train

asked by summer
56. ## Internet

How did a website like YouTube become so popular? Over a million people use it!

asked by AL 92
57. ## science

the existence of background radiation is offered as evidence supporting the steady state theory or big bang theory

asked by Anonymous
58. ## science

At the beginning of the____Era, the earth had no crust. Just need to know if my answer or right or wrong. Thanks! :) modern era

asked by ant
59. ## math

how does secx(tanx + tan^2x- sec^2x) simplified to sec x (tanx -1)?

asked by Jin
60. ## algebra

Jane is a saleswoman. She is paid a base salary of a month plus a commission on the sales she makes. What was her sales amount last month if she earned a total of ?

asked by darla
61. ## college- strength of material

i have initial and final gauge length and diameter and also have max load. Now i have to draw stress strain diagram. I know how to draw that graph but i a not provided with failure load or yield load so i am not sure how to graph. We had performed

asked by Nick
62. ## science

The moon revolves around the____. Just need to know if my answer or right or wrong. Thanks! :) Earth

asked by ant
63. ## childcare

Ms. Sue I observe that you are answering questions at this time. Would you be kind enough to look over my questions posted today. August 19,2010 at 12:07 p.m. Thanks

asked by action
64. ## English

Write five sentences about the role of education in successful financial planning, in which you correctly use a different verb tense in each sentence and identify verb tense used

asked by Anonymous
65. ## cultra

• • Write a 1,400- to 1,750-word autobiographical research paper analyzing the influences of race as it relates to your community. In your paper, write your first-person account of how human interactions in your community have been racialized. For the

asked by fee
66. ## Math

A ball rolls into a corner of a room, where it touches both walls (and, obviously, the floor). A larger ball rolls into the same corner so that it touches both walls and the first, smaller ball. The small ball has a radius 1 inch. What is the radius of the

asked by John
67. ## Math

the question is "The track at Beck's is rectangualar. The dimensions of the inner playing field are 200 by 80 feet. The track is 13 feet wide on all sides . How many feet will Becky walk if she follows the outside edge of the trck?" How do you work that

asked by Ao
68. ## 415

What is a High Performance Team (HPT)? can someone give me a few examples.

asked by meshelle
69. ## MAT/117- Appendix E

Answer the following questions. Use Equation Editor to write mathematical expressions and equations. First, save this file to your hard drive by selecting Save As from the File menu. Click the white space below each question to maintain proper formatting.

asked by Dee
70. ## Geometry

An equation using the numbers 2,4,6 and 8 to get the answer to be nine. You may use multiplication, division, subtraction, addition, and parenthesis. im so stumped.

asked by Natalie
71. ## government

write several paragraphs stating advantages and disadvantages to the unitary, confederate, and federal systems of government.

asked by Brittany
72. ## economics

The mortex company assmebles

asked by haynaku
73. ## English

Colors of Our Friendship Friendhip is full of colors; Red is action; It makes us feel active. Green is freshness; It makes us to live harmoniously with others. Gray is gentleness; It makes us feel generous to others. (Is the poem grammatical?)

asked by rfvv
74. ## MATH

Find the z-score related to the raw score, mean, and standard deviation as follows. Assume a normal probability distribution.

asked by Anonymous
75. ## college

Y=-1777x+27,153 Y= g\un deaths in United States X-years after 2000 x=0

asked by Georgetta
76. ## 8th grade

A leaky faucet fills a 100 millimeter cup in 10 minutes. 1.how much water is wasted in a day?a week?a non leap year? 2.How long does it take to waste a kiloliter of water? (hint:1 kiloliter=1000000 milliliters)

asked by timmy
77. ## biology

explain why scientists look at the health and population of organisms to measure to effects of pollution in an ecosystem instead of directly measuring the concentration of chemical in the environment.

asked by amelia
78. ## math

Write the statement indicated. Write the negation of the following. A happy face is a smiling face.

asked by Luke
79. ## ALGEBRA 1

Consider the equation 4x + 6y = 48. Part 1: On your own paper, graph this equation using the slope-intercept method. In the space provided, explain, in words, each step of the procedure you used. Make sure to use COMPLETE SENTENCES IN PERFECT GRAMMER Part

asked by TOBIAS
80. ## math

Write the decimal representing 8/9. Explain your reasoning.

asked by A
81. ## algebra

convert to decimal notation 8.87*10^7

asked by jess
82. ## MATH

If P(A)=3/5 what are the odds in favor of A occurring?

asked by Anonymous
83. ## math

charlotte has 3 times as many pencils in her schoolbox as rebecca.together they have a total of 24 pencills. how many pencils does rebecca have?

asked by charnette
84. ## hrm 240

need help it says to naming one internal and three extrnal ways that i could recruit for the job the job i chose is bank manager and what are the advantages and disadvantages to this is? what i want to know is what is internal and external ways?"

asked by me
85. ## math absolute values

please solve this: {3z} for z=62

asked by bravo
86. ## US History

For the "Square Deal" what were key policies? -Pure Food and Drug Act -Meat Inspection Act -Interstate Commerce Commission ...

asked by Amy~
87. ## MATHS

5 women complete half a job in 15 days. How long would it take 3 women to do the whole job? Thanks for your help

asked by BRYAN
88. ## science

A falling star is really a ______burning up in the atmosphere of the earth. Just need to know if my answer or right or wrong. Thanks! :) meteor

asked by ant
89. ## biology

Are antibody synthesized by 1. B lymphocytes 2. Phagocytes 3. Helper t-lymphocytes 4. Killer t-lymphocytes Thanks, Cathrine

asked by cathrine
90. ## English plz help me .

Please help me in english .I have to submit this essay very soon.plz Throughout the history, man has always been obsessed for the immortal life .Gilgamesh was one of them. Who has desire for immortal life. He was a king of urak. He was powerful and full of

asked by shan
91. ## statistics

A normal distribution is any distribution that is not unusual. True or false?

asked by Brenda
92. ## Math

If ABCD is an arbitrary convex quadrilateral, then the area enclosed by ABCD is described by the formula (1/2) AC*BD*sin(theta) , where ! is one of the angles formed by the intersecting diagonals AC and BD. Prove this formula, and explain why it does not

asked by John
93. ## math

What is the P (A) if we know that the odds in favor of A occurring are 3 to 4?

asked by Anonymous
94. ## child care

1. A main source of fat and saturated fatty acids in children's diet is A> meat B. candy C. whole milk D. french fries (My answer is D) 2 when a child demonstrates an inability to leap over a barrier, his teacher checks to see if he has mastered the skills

asked by action
95. ## Algebra

An object weighs 10 lbs and is 200 miles from the center of the earth. Solve for the constant

asked by Candace
96. ## Chemistry

Sorry. What I meant was: How do we improve the efficiency of Flash Column Chromatography?

asked by Alan
97. ## SCIENCE

The earth is a______.It has four different layers, some thicker than others.? a) spiral b) rotunda c) sphere d) globule Just need to know if my answer or right or wrong. Thanks! :) C

asked by ant
98. ## science

The Paleozoic Era is noted for which two changes? a) rocks were formed b) the earth heated up c) people appeared on earth d) mountains were formed Just need to know if my answer or right or wrong. Thanks! :) d

asked by ant
99. ## MATHS

The sum of three consecutive multiples of 3 is 36. The smallest of the three will be.....? answer is 9

asked by DONNA
100. ## English

Life is full of colors. Red is love; 1)It comes from our hearts. Blue is sadness; 2) It falls from our eyes. (In the poem, what does each 'it' refer to?)

asked by rfvv
101. ## science

A total solar eclipse means that no sunlight reaches a certain area on earth. true false Just need to know if my answer or right or wrong. Thanks! :) false

asked by ant
102. ## soc402

Compare and contrast the roles the prison system, the family, and the social stratification system play

asked by rusty
103. ## Math

If the graph y = 4sin(bt) repeats itself every 30 degrees (and not more frequently), find the value of b.

asked by John
104. ## MATH

What percent of heights of adult males in the normally distributed general population have z-scores between -1 and +1?

asked by Anonymous
105. ## MATH

if P(B)=1/3 compute P(not B)

asked by Anonymous
106. ## English help

it is second paragraph. I want to tell you English is my second language.I try my best to do it in right way . After the death of Enkidu .He asks him self does this mean I have to die too? This thinking changes his direction. It is not doubt to say that

asked by sha
107. ## Chemsitry

How do we improve the efficiency of Column Chromatography?

asked by Alan
108. ## Business Economics

"How do I find out which manufactures in the US sell the most Oxygen Concentrators?"

asked by Claudia
109. ## science

When any spot on the surface of the earth faces the sun, that spot is dark it is night. true false Just need to know if my answer or right or wrong. Thanks! :) false

asked by ant
110. ## 8th grade math

12x+3x=15x use the distributive property to show that each statement si true.

asked by Anonymous
111. ## math

3% of \$1,120,000

asked by Anonymous
112. ## Health Care Fnancial Accounting

the local school system asks to submit a proposal to do pre-employment physicalsfor 60 bus drivers. What financial or accounting informaton is needed to submit the proposal? what shall I charge the school system?

asked by Jerry
113. ## college

Describe in Hamlet, Prince of Denmark the representative of the literature in the culture from which it comes.

asked by Moses
114. ## science

Very hot, liquid iron and sulfur are found 1,800 miles deep in the earth in the _____.? a) inner core b) mantle c) outer core d) crust Just need to know if my answer or right or wrong. Thanks! :) c

asked by ant
115. ## math

make A 14 dot array that has exactly 2 rows

asked by brian
116. ## 1st grade

Is this a sentence? The fox sits.

asked by Daby
117. ## math

Name the property of addition that has been applied. (8+2)+ 2 = 8 + (2 + 2)

asked by Luke
118. ## elec

Can f(t) = u(t)5cos(2pi t) be represented directly as a fourier series?

asked by jon
119. ## math

The lottery payoff in a letter game at a church social is determined by the single letter the winner holds. There are four letters, A, B, C, and D. The probabilities that each will be drawn are 1/2, 2/10, 4/10 and 3/10 respectively. The payoffs are \$2 for

asked by Anonymous
120. ## US History

1.Square Deal Would the Square Deal be considered a motto?

asked by Amy~
121. ## Fundamentals of Cost Analysis (Economic Analysis)

What would be the present value of an item that has a salvage value of \$25,000 at the end of five years? Assume a discount rate of 3.8% for an end-of-year factor. Carry calculations to four decimal places.

asked by D
122. ## political science

How do local governments get their revenue in U.S.? and what are the sources?

asked by amelie
123. ## preschool

what is an integer? a postitive one? a negative one? can you add them?

asked by 8th grade
124. ## geometry

I am having a hard time determining what formula I need to solve the following: On a hexagonal window the height is 1.3m. Find the width.Do I use the pythagreom theorem (but I have only one known number) or do I use the formula 6(1/2as)? I'm confused. The

asked by Cendrillion
125. ## math

find a 9 digit # that fits. the first3 #'s equal 1/3 of the last 3. The middle 3 #'s are the result of subtracting the first 3 from the last 3. All the digits from 1-9 are used only once. What is the number

asked by brad
126. ## science

Vertebrates" is the name used to describe mountain-building processes. a) true b) false Just need to know if my answer or right or wrong. Thanks! :) false

asked by ant
127. ## science

ka value for acetic acid?

asked by cf september
128. ## math

Find the GCF of the numbers using an appropriate method.Explain your reasoning. 240; 10,000 and 4500

asked by Sarah
129. ## math

Perform the calculation mentally, show your work. 3 + 57 + 44 + 36

asked by A
130. ## Math

The points (2, 3,6) and (6, 3, !2) both lie on the sphere x 2 + y 2 + z 2 = 49. What is the shortest path between them if travel is restricted to the surface of the sphere?

asked by John
131. ## geometry

a.40 a.2(3(5+2)- b.6-2(4+5)+6 b.-6 c.3.8/4+1 d.5-2.3+6(6+1) c.7 d.59

asked by Robin
132. ## Algebra 2

I need help finding the vertex of the parabola y=x^2-3x-21

asked by James
133. ## glendale

How do ourfood choices affect our own consumption of the nonrenewable energy available to sustain life?

asked by Anonymous
134. ## ALL OF JISHKA STAFF

Hello I had a couple of questions and was woundering if you have staff members that are teaching or have taught AP BIOLOGY AP PHYSICS B AP CALCULUS AB AP CHEMISTRY I was told that the AP BIOLOGY teacher had gotten extremly ill =(, has he come back? Also

asked by Kate
135. ## child care

two children using finger paints agree to share them. They're engaged in play. A. associative group B. cooperative C. parallel D. groupthink (My sanswer is A) Do you think this correct? Need your feedback.

asked by action
136. ## science

ka value for acetic acid?

asked by cf september
137. ## Germen

I have to explain why certain verbs use sein instead of haben for the formation of the Perfekt? and name some verbs that use sein instead of haben for the formation of the Perfekt!

asked by Mara Selene
138. ## algebra

find -x when x=-21

asked by newt
139. ## math

how do you find the derivative of square root of x

asked by Jin
140. ## citing

i need help citing.

asked by bryce
141. ## math

2,3,7,16,32,_,_,_,_.

asked by barbara ramey