The first question is

1. Simplify without negative exponents

-7x^-2

Now doing this one I had trouble, the answer I came up with was 1/7x^2

2. Simplyfy without negative exponents

x^-7/x^2

This was my reasoning x^-7+2=x^-5=1/x^5

I guess I got it wrong though?

3. Simplify using positive exponents

(-4v^7/3)(2v^-1/3)

I did (-4)(2) (v^7/3+-1/3)= -8v

4. Simplify using positive exponents

3x^2/3/7x

I got 3/7x^1/3

Please help ASAP

Can anyone at least help with one?