PLEASE HELP ASAP!! MARKING BRAINLIEST!!!

1. Represent the expression [tex](a^5[/tex]·[tex]a[/tex]÷[tex]a^{-3} )^{-1}[/tex] as a power of a, where a≠0.

2. Simplify.

2a. -5[tex]\sqrt{4x^2}[/tex] if x≥0

2b. -5[tex]\sqrt{y^2}[/tex] if y>0

3. Solve each equation.

3a. [tex]\sqrt{x^2} =x[/tex]

3b. [tex]\sqrt{y^6} =y^3[/tex]

3c. [tex]\sqrt{z^4} =z^2[/tex]

Thank you so much to whoever solves these!! Remember, I am marking brainliest!!!!