Back to school forgot math (easy precal that i should have remembered)?

Question

these are the ones i couldnt do for some reaseon...so you dont have to give me answers but i do need help getting so some answers...

1.(5x(x+2)^(-2/3))+(3(x+2)^(-5/3))

2.6ax+3ay-10bx-5by

3. domain? (4x-3)/(x^2-5x-6)

4. (ab)/((1/a)+(1/b))

Answer 1

im going to be in pre cal this year and i dont remember c**p from algebra 2 last year gonna be sc... the first cople of days or weeks :D