smart people, answer these questions please?

Question

1. 7(3c-2d)-5(2c-3d)
2. 3(m-n)-3(m+n)
3. 3(r+2s)-(r+s)
4. 2(3p-2q)-3(2q-7q)
5. 2(3x-5y)-3(2x-y)
6. 4(3g+2h)-(5g-2h)
7. 4(3a-4b)-3(2a+5b)
8. 7(2x+y)-5(x-2y)
9. 3(2c-3d)-3(3c-2d)
10. (3m-7n)-(2m+3n)
11. (6w-3y)-(3w-4y)
12. 3(3x+2y)-4(3x-4y)
13. 4(3x-4y)-(2x-7y)
14. x(3x-2y)+y(3x-4y)
15. a(3a-4b)+2a(a-b)

^ = powers

16. 11t^2(t^3-5)-(2t^5-11t^2)
17. 5p^2(p+3)+3p(p^2-7)
18. 3y(5y^2+3)+2y(3y^2+1)
99. 2x(3x+2)-x(5x+1)
20. a^3(a^2-1)-a^2(a^3-3)

ITS NOT HOMEWORK!

i didn't understand so i asked my teacher for more worksheets and i still don't understand so you don't have to tell me the answers but just explain how to work it out in the simplest from

Answer 1

Okay, you are working with distribution:
A) 7(3c-2d)-5(2c-3d)
break this up into two pieces like so:

1st piece:

7(3c-2d)

you want to distribute the 7 to the 3c and the -2d:

[(7)(3c)] - [(7)(2d)] so we have:

(21c - 14d)

2nd piece:

-5(2c-3d) ----> you can work this problem 2 ways. You can decide to use the minus sign and distribute it into the parentheses OR you can set it aside and do it later. I am going to use it now because sometimes we forget about the (-) and get the answer wrong. I'll do it both ways to show you that either way you'll get the same answer as long as you're careful.

-5(2c-3d) 5(2c-3d)
= (-10c+15d) = (10c-15d)

=(21c - 14d) + (-10c+15d) =(21c - 14d) - (10c-15d)
=21c-14d-10c+15d =21c-14d-10c+15d

now put like terms together. This just means to put the same variables(like c,d) together so you can add or subtract them.

=21c-14d-10c+15d
=21c-10c-14d+15d
=11c+1d
=11c+d

That should help you out with the rest of them.

Answer 2

For the first one:

7(3c-2d) - 5(2c-3d)
21c-14d-10c+15d
11c+1d

Multiply the terms in the ( ) by the number outside. Then, just combine terms. Be careful with negative numbers X negative numbers...

You should be able to do the rest.

Answer 3

15 questions??? This is not help, this is asking someone to do your work for you hun... if you are having problems see if you can work with a class mate to do the work. If we do this for you, you will not understand how to do it yourself and will do poorly in your state tests. I would be happy to help you figgure out how to go about doing these problems... but I wont give you the answers and work to your homework.

Answer 4

These seem to be statements rather than questions.