PRE ALGABRA help please????help!! if you can explain how you did them all if not its fine.....

well how do you do these and please answer all of them

Simplify this expression:
-(3x)2


Simplify this expression:
(3t2/5)2

Complete the equation:
(4m)? = 256m4

Complete this equation:
(b?/5)2 = b10/25

Explain why (-xy)2 = (xy)2.

Simplify this expression:
(-xy/2xy4)5

Simplify this expression:
(x3/2y4)5

Wow your problems are confusing. Not hard to figure out when I at least know what the problem is.

When you have an exponent use the "^" sign to show that its an exponent.