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480 cm³

Here's the answer to part b:

You should check this carefully, as I did it rather hurriedly!

AREA of the trapezoid ===     2 m  x  (1.4 + .6)/2 =  2 m^2

VOLUME of the pond = Area of trapezoid by width    = 2 m^2 x 1 m = 2 m^3

In 30 minutes volume lost =  .2m x 2 m x 1 m / 30 min  = ..4 m^3 /30 min

2 m^3    /  .4 m^3/ 30 min =   150 minutes to completely drain      

Question is unclear    :  it will take 150 minutes to completely drain from the start    or    120 from the time 20 cm has drained .

thanks

yes Thx, I know; but the calculator online give me error.

I would like to inform the owner of the site but I don't know how to do it.
anyway thanks again.
soniay

Second one..... according to the line segment on the number line ,  x is between -2 and +7   but does not include the actual -2 (hollow dot)

so      x > -2      (or  -2< x)          and  x <=7     combine to form      -2< x <= 7

The first one is A       cover up the  '7' and look at it ....it says   'y' is greater than or equal to 3

                                  now cover up the '3'      it says y is less than 7    

Originally     24   red       24 black

  then           16 red         24 black      ratio  red/black now   16:24 =  2:3

You can look at this question as follows:

Just work out the volume of the cylinder and half it

Oof. I did not understand the problem at all then. Thank you for clearing that up! Sorry about that.

The answer should be X=1800.

36/2 = 1800/100

a - The answer of 5,304 in NOT wrong! It just wasn't explained to you how they arrived at the answer. What is the difference between 1st term and 2nd term? 101 - 97 =4. Each term after the first is 4 LESS than the previous term.So, you get: 101 - 4 =97 - 4 =93 - 4 =89 - 4=85.........etc. all the way down to 5 - 4 =1. And then each term is "squared":

101^2 =10,201 - 97^2 =9,409 + 93^2 =8,649......etc.
This is the "closed form formula" that generates each term of your sequence:  (-1)^(n+1)*(105 - 4*n)^2, where n=1 to 26.

And this is what you get, when you expand your sequence: [10201, -9409, 8649, -7921, 7225, -6561, 5929, -5329, 4761, -4225, 3721, -3249, 2809, -2401, 2025, -1681, 1369, -1089, 841, -625, 441, -289, 169, -81, 25, -1]
Sum them up on your calculator term by term and you should get =5,304.
I hope you understand it now. Good luck to you.

https://web2.0calc.com/questions/need-help_24323

Please include the link to your first post.

*by first, I mean the first question I have posted to this site, though I have asked it once before on a different post.

No. This is the first question I have posted to this site.

I am asking for help with a proper explanation so that I may understand the problems and their solutions better.

I am under the "guest" profile because I haven't made an account and I don't feel the need to.

If you don't want to answer, that is fine, but I would appreciate if you could at least point me in the right direction.

Thank you.

The first one:  0.6 = 6/10 which reduces to 3/5 so the answer is C. 

The second one:  A., D., and E. 

I think they mean double, not dabl

You would want to find the zeros of this function. You could try factoring out a common multiple and try to factor, or use quadratic formula. 

thnx 

for the at least three cups each day how do you find out the no.