I have a few of these questions that I need help on, please help me!

Question

1. 16x^2 + 2 + 2x - 15x^2 - 1 + 14x
2. 2x^2 + 8 8 - 4x + 3x - 6x^2 + 7
3. 2x^2 = 6x - 7x +8 - 3x^2 + 1
5. (m^2 - m - 4) + (m - 5)
6. (5x^2 + x - 3) - (-2x^3 + 4)
9. 64^10/64^5
10. x^11/x^4
11. 4^3 x 4^12
12. 4^4 x 4^44
14. 3^3/3^6
15. (9 x 10^6)(7 x 10^5)
16. (1.1 x 10^-5)(3 x 10^-2)
18. -3(4x + 5)
19. 3k^2(-2k^2 - 4k + 7)
20. (-6x)x 7x^2
21. (7y^2 - 3y) + (8y^2 - 8y)

Answer 1

You are kidding!

No one is going to do 21 problems for you.

Choose 5 problems, work them out, give the answers, post them, and someone may check them for you.

Btw -- asking for a bunch of answers could get you banned from posting here.

Answer 2

Ms. Sue, I'm sorry! I got these answers for those problems. :\
I didn't post the choices and my answers cause I thought it'd be too much work...
1. x^2 - 12x + 1
2. -4x^2 - x + 15
3. 2x^2 + x + 9
5. m^2 - 2m - 9
6. 14t- 8
9. 64^50
10. x^7
11. 4^36
12. 4^48
14. 1/27
15. 4.1 x 10^-7
16. 64t^10
18. -12x - 15
19. -6k^3 - k + 10k
20. -42x^3
21. 15y^2 -11y

Answer 3

1. x^2 - 12x + 1 ----> x^2 - 16x + 1
2. contains typo
3. is an equation, not expression
5. m^2 - 2m - 9 ----> m^2 - 9
6. 14t- 8 ----> doesn't even match question
9. 64^50 ---->64^10/64^5 = 64^(10-5) =
need to study rules of exponents
10. x^7 --- YEAHHH
11. 4^36 -- 4^3 x 4^12 = 4^(3+12) = ...
need to study rules of exponents
12. 4^48 === correct
14. 1/27 ==== correct
15. 4.1 x 10^-7 === not even close
== (9 x 10^6)(7 x 10^5) = 63 x 10^11 = 6.3 x 10^12
16. 64t^10 === doesn't even match the question
18. -12x - 15 === nope
19. -6k^3 - k + 10k ==== nope
20. -42x^3 ==== 0k , but don't use x to represent multiplication if x is the variable
21. 15y^2 -11y ==== ok