Ok, again folks I am asking for your help!! I have managed to do the rest of the 100 questions but I am totally stuck on these ones (after I managed to get some great help on my other topic, thank you!)

I need whatever is in brackets, to be the subject.

(sq) = squared or whatever the value is

Q1. v(sq) = 2gh (h)

Q2. v = 5a

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a - b (b)

Q3. c = [square root over this whole equation]2hr - h(sq) (r)

Now these ones are simplifying again...

Q1. a(sq) x a(3rd) x a(-5)

Q2. [square root] 9a(4)b(sq)

Q3. [square root] X(3rd) x X(5)

Thank you very much for all your help!!