# Rain

Popular questions and responses by Rain
1. ## AP Chemistry

A 23.9475 g sample of impure magnesium carbonate was heated to complete decomposition according to the equation MgCO3(s) → MgO(s) + CO2(g). After the reaction was complete, the solid residue (consisting of MgO and the original impurities) had a mass of

2. ## Math

Three friends drove radio controlled cars around a track. The table below shows the number of laps completed by each person and the time it took. Latoya Mary Melissa Number of laps 9 30 20 Time (minutes) 3 6 5 Write the number of laps completed per minute

3. ## Limit

Determine a region whose area is equal to the given limit. lim x-> infinity Sigma (n on top, i=1 on bottom) (2/n)*[5+(2i/n)]^10 I started with delta x=b-a/n =5-0/n =5/n The width of delta is 2/n so b-a=2 I'm not sure how you got 5-0/n The integrand looks

4. ## Physics

Three charges (q1 = 8.7 nC, q2 = -7.2 nC, and q3 = -4.8 nC) are at the corners of a square of side a = 9.2 cm, as shown in the picture. Determine the magnitude of the resultant electric force on each charge.

5. ## Solid Geometry

Find the Lateral area in cm square of the following right pryramid. 1. Base is regular octagon of side 20cm and altitude of 20cm. 2. Base is regular hexagon of side 20cm and altitude of 30cm. 3. Base is regular hexagon of side 30cm and slant height of

6. ## Chemistry

Reaction 6 1. Place a piece of mossy zinc in a test tube 2 add hydrochloric acid solution to the test tube until the mossy zinc is completely covered What gas was released in reaction 6 and how could you test the gas to confirm its identity?

7. ## math

Stephen drove at a constant speed from Town X to Y at 9 A.M.yesterday. Half an hour later Cole drove from Town X to Y at A constant speed that was 30 km/h faster than Stephens. By 9:30 A.m, Stephanie had already traveled 40 km. Cole caught up with Stephen

8. ## Geometry

Find the possiable measures for line segmant xy in triangle xyz if xz is 6 and yz is six. Im really confused- if you could explain this i would really appericate it! Thanks!

9. ## Calculus

f(x)=x^2 - 5x +7 and g(x) 3/x 1) Indicate points of intersection 2) compute the area enclosed by the graphs of f(x) and g(x). 1) (1, 3) , (3, 1) 2)Area = âˆ« [1 to 3] [(3/x) - (x^2 - 5x + 7)] dx = [3 ln x - (1/3)x^3 + (5/2)x^2 - 7x = 3 ln 3 - 8/3 am i

10. ## Mathematics

In a right rectangular pyramid with base edges a=18 cm and b=10 cm the slant height towards a is k=13 cm while the slant height towards b is l=15 cm. Find: The surface area of the pyramid

11. ## Physics

Imagine two billiard balls on a pool table. Ball A has a mass of 7 kilograms and ball B has a mass of 2 kilograms. The initial velocity of the ball A is 6 meters per second to the right, and the initial velocity of the ball B is 12 meters per second to the

12. ## History

1. Which of the following describes an accomplishment of Georgia’s royal governors? A. Declared the Catholic church the official church of Georgia B. Established the colonies first court system the court of Confuciu established the colonies first court

13. ## Chemistry

0.25 mol dm-3 solution of hydrochloric acid?

14. ## help math

1.Write the ratio in the simplest form 16:24 1:2 4:3*** 3:4 2:3 2.Solve the following proportion p/6 =7/8 p=5.25*** p=8 p-10.5 p=42 3.James has a model helicopter. The model is 8 inches long and 7 inches wide. The actual helicopter is 56 inches long. What

How did the supreme court decision in Worcester v Georgia and the Indian Removal Act lead to the removal and resettlement of native American groups? please help me with this all i want is help getting started or a sample essay

16. ## physics

A car drives straight down toward the bottom of a valley and up the other side on a road whose bottom has a radius of curvature of 115 m. At the very bottom, the normal force on the driver is twice his weight. At what speed was the car traveling? I have

17. ## Computer Science/Pseudo Code Python

Hi, I'm confused about an assignment. I'm not sure what to do and would like some help. An example: Write a program that obtains two integer numbers from the user. It will print out the sum of those numbers. Pseudo code: Prompt user to enter first integer

18. ## math

the length of a rectangle is 8 cm more than its width. If the length is decreased by 9 and the width is tripled, the area is increased by 50%. What was the area of the original rectangle?

19. ## Chemistry check

H2O2+MnO2 -----> MnO2 + H2O Is my work correct?

20. ## Prob and Stats

For questions 1- 5 use confidence intervals to test the hypothesis. 1) A light bulb producing company states that its lights will last an average of 1200 hours with a standard deviation of 200 hours. A sample of 100 light bulbs from the company were tested

A scientist observes that termites are fed a certain antibiotic die a starvation after a few days. The scientist also notices that certain protists that live inside the termites guy are affected by the antibiotic in a peculiar way: although the protists

22. ## Science urgent help

A scientist observes that termites are fed a certain antibiotic die a starvation after a few days. The scientist also notices that certain protists that live inside the termites guy are affected by the antibiotic in a peculiar way: although the protists

23. ## Math 3 quick questions

Factor: A.). 4(3x+1)^2 -5(3x+1) +1 B.) 5(2-3x)^2 -28(2-3x)+15 C.) 2(3a-4)^2 - (3a-4)(a+2)-6(a+2)^2

24. ## To : bobpursley

Please could you help me on my question:)

25. ## Science urgent help please:)

Compare the forms of locomotion used by the 4 phyla of animal like protists? Describe the process of conjunction . Is conjunction a form of reproduction? Explain In what ways are animal like protists helpful to other living things?

26. ## biology, genetics

Suppose that r, red, and sc, scarlet, are two recessive eye-color mutations that lie 20 map units apart on the Drosophila X chromosome, and that each causes a red eye color in place of the wild type purple color. A. If a female from pure-breeding rr stock

27. ## Math

This year, the sum of Mr. Bellini's age and his son's age is 38 years. 4 years ago, Mr. Bellini was 5 times as old as his son. How old is his son this year? How old is Mr. Bellini this year?

28. ## Physics

A thin rod L = 9.0 cm long is uniformly charged and has a total charge of 4.4 nC. Find the magnitude of the electric field at a point P located at a distance R = 13.5 cm from the center of the rod when: (a) The point P lies along the axis of the rod

29. ## Science

I need some answers for my science essay... We have a research report and I cannot find these answers ANYWHERE. The sport I chose for the assignment was Quidditch (awesome, right?) and I cannot find work for a bludger, quaffle, golden snitch, or players. I

Which of the following selections contains a run-on? If none of the selections contains a run-on, select "Correct." A. Everyone praised Matthew for his will power. B. He quit smoking five years ago, he still craves a cigarette from time to time. C.

31. ## Spanish

Im confused about the directions on my hw. I cant really figure out what im supposed to do. This is what it says- Las siguientes personas quiseron hacer varias cosas el sabado pasado. En lugar de eso, tuvieron que hacer cosas diferentes. Expresa eso. The

32. ## Basic Algebra

Im having a stupid moment and i cant figure this out- x-1 x-2 --- + ---= 1 2 3 assume the ---- is a division bar

33. ## spanish

How do you say 'he is allergic to' in spanish? I think it would be something like this: el esta' (hower you say allergic to)los flores, but im not sure

34. ## spanish

How do you say behind in spanish?

35. ## geometry

Whats the midpiont formula? I am totally blanking and i need it asap

36. ## law studies

what idea is fundamental to the contemporary concept of criminal justice

37. ## English

title of AIDS on research paper

38. ## social science

Please could you help me with understanding how the boundaries and links between states of past culture have changed. Thanks This is a very broad question. First, you must define what you mean about the word "past".Does the thinking behind this question

39. ## science

I need to produce a related structure of the molecular features of carboxyli acid, size hydrocarbon group on ester and distance between oxygeeb atom joined to the ring and -oh group of the carboxylic acid? I have got no ideas on where to start. Start by

40. ## Calculus

could anybody please explain how sec x tan x - ¡ì sec x tan^2(x) dx = sec x tan x + ¡ì sec x dx - ¡ì sec^3(x) dx What I don't understand about your question is what is ¡ì ? i just want to know if those two equations are equal, if yes, how did one

41. ## Calculus problem

Evaulate: integral 3x (sinx/cos^4x) dx I think it's sec3 x , but that from using a piece of software, so you'll have to verify that. Using uppercase 's' for the integral sign we have S 3sin(x)/cos4dx or S cos-4(x)*3sin(x)dx If you let u = cos(x) then du =

42. ## Calculus problem

I really need help on this question. A goldsmith makes a wedding band by taking a gold ball and drilling a wide hole through it. The wedding band has to be 1 cm wide and the hole has to have a diameter of 2 cm. Given that gold weighs 19.32g/cm^3, how heavy

43. ## Polar coordinates

I need some help on this Calculus question about polar coordinates. Consider a pasture bordering on a straight river. At 2m from the river, a goat is tied to a pole with a 4m long rope. What is the area of grass that the goat can graze? There are a couple

44. ## Math

a) Is âˆ«[-1 to 1]e^x^3 dx positive, negative, or zero? Explain. I think is positive but i don't know how to explain it. b) Explain why 0 < âˆ«[0 to 1] e^x^2 dx

1. ## science

Lun you are awesome!

posted on February 12, 2020
2. ## History

Ms. Sue I think so but I need a 100 so I want to check

posted on September 26, 2019
3. ## history

1. Which of the following describes an accomplishment of Georgia’s royal governors? A. Declared the Catholic church the official church of Georgia B. Established the colonies first court system the court of Confuciu established the colonies first court

posted on September 26, 2019
4. ## Trigonometry

RPC stands for rectangular coordinate plane

posted on August 1, 2019
5. ## math

Ok Anna Banana, not trying to be rude boy how else would you get here? You obviously searched up this question to get here so I are cheating.

posted on June 4, 2019
6. ## chemistry

.105 M

posted on March 28, 2019
7. ## Ed. Tech

Does anyone know what test these answers go to?

posted on August 15, 2018

thx justian for the help

posted on February 22, 2018
9. ## Social Studies CHECK ANSWERS

The answers are correct, except for 5. Which is C

posted on November 27, 2017
10. ## AP Chemistry

Thank you!!!

posted on September 19, 2017
11. ## Math

24. Is so wrong it hurts.

posted on August 29, 2017
12. ## Math

How did you get these answers

posted on August 27, 2017
13. ## Math

9/3-Latoya 30/6-Mary 20/5-Melissa

posted on December 20, 2016
14. ## physics

29.0419194

posted on December 8, 2016
15. ## physics

p=

posted on September 29, 2016
16. ## Chemistry

thank u so much :)

posted on May 21, 2015
17. ## Math 3 quick questions

Oh ok thanks:)

posted on October 2, 2014
18. ## physics

posted on October 29, 2013
19. ## Physics

yes, it is

posted on August 30, 2013
20. ## math

an angle has a measure of (5x+7) and another angel has a measure of (2x+54) together they form a linear pair find the smallest angle

posted on April 4, 2013
21. ## writing skills

I had the same question on a test, I also chose A and it was wrong.

posted on November 20, 2012
22. ## Physics

Never mind Elena, when I wrote it out on paper it made sense. Thank you very much! :)

posted on July 8, 2012
23. ## Physics

Order, clockwise- q1, q2, q3.... Could you explain the procedure in words?

posted on July 8, 2012
24. ## Science

tHANKS

posted on June 2, 2011
25. ## Science

posted on May 26, 2011

Ah! Okay then! I see what you mean now. Thank you so much for making that clear. I was confused for a bit there. XP Thank you so very much!

posted on July 7, 2010
27. ## simple equations ( math)

216*1.6 sorry don't have a calc but that will give u the answer

posted on January 10, 2010
28. ## Spanish

think i figured it out now- thanks to everyone who tried i appericate it :)!

posted on January 10, 2010
29. ## Math

this is imposible uless it is a right triuabgle. You need to knw the height. formula is: b*h A= ---- 2

posted on January 10, 2010
30. ## english

i copyed the responce and made teth edits in (). The book "We are all welcome here” by Elizabeth Berg relates to the time era of Elvis Presley and his home town. The narrator and the protagonist of the book is a 14 year old girl named Dianna Dunn. In my

posted on January 10, 2010
31. ## math

ur deviding by -7 so the sign would be flipped to < and it would be -5

posted on November 12, 2009
32. ## Basic Algebra

Thanks a bunch!

posted on November 12, 2009

12 grams or 12x the variable g

posted on November 12, 2009
34. ## History quick ?

I would go with 24 but im not really sure ekkk

posted on November 12, 2009
35. ## Civics

Cost- the upfont cost of building, for example, a subway would be extremely high and most cities would not be able to affford it- even if it was eventually paid up. the debt would be too high

posted on November 12, 2009
36. ## science

because helium has a lower density the oxygen- ie the molecules weigh less in helium

posted on November 10, 2009
37. ## Physics Gr11 Light Unit - Blind spot

This may be wrong- i havent taken phisics yet, but it makes some sense- because a blind spot is relativelly small it would be difficult to completely lose sight of an object because of the size difference, and also a persons eyes are constantly moving. For

posted on November 10, 2009
38. ## math

it sounds like a font end estimation would be more exact bc depending on which digit ur rounding to the answer could be uber off

posted on November 10, 2009

1- its 7 2- its 12 this is bc they are the greatest #s that can go into the two origional #s if that makes any sense

posted on November 4, 2009
40. ## substitution method

2x+(x-7)=8 you have to substite the equation for y into the problem

posted on November 4, 2009
41. ## Algebra

2 maybe?

posted on November 4, 2009
42. ## Mathmatics

you really shouldnt just post every question on your hw sheet...

posted on November 4, 2009
43. ## spanish

figured it out- its atra's de

posted on November 4, 2009
44. ## Math

i would get a calculator.... i got 6(+or -) 5.291502622

posted on November 4, 2009
45. ## Math

In the question you are dealing with a 1/2 probability rate, so in a-it wouls be 2 of the 1/2 rates which is 25% b-it would be the same b/c its still two 1/2 senerios, so 25% again c-same thing 25% d-this is a 75% chance b/c the secod child is still an

posted on November 4, 2009
46. ## Math

Pb is 1/4 of Pa if that helps, but i don't really understand what you or maybe the question is asking

posted on November 4, 2009
47. ## Mathmatics

does this help at all?

posted on November 4, 2009
48. ## us history

minunite men in the revolutionary war or a malitia

posted on November 4, 2009
49. ## Mathmatics

what do you mean? that's hard to fallow...

posted on November 4, 2009
50. ## Mathmatics

again... 7x=4x+21 subtract 3x=21 divide x=7

posted on November 4, 2009
51. ## Math.

10/x+x=7 multiply times 10 x+x=70 add the xs 2x=70 divide x=35 i think... its been a while

posted on November 4, 2009
52. ## Math.

the straight line is a division sign one sec and ill figure out how to solve it

posted on November 4, 2009
53. ## Mathmatics

Here are the steps: 5x-14

posted on November 4, 2009
54. ## geometry

angle addition postulate- is there is an angle that is divided u take the measurements of the two angles that are created and add them together

posted on September 17, 2009
55. ## geometry

slope= y= mx+b midpoint= (Y1-Y2/2), (X2-X1)/2

posted on September 17, 2009