if y = inverse of x^2 and y=10 when x = 35 what is x when y = 15

Question

WHAT IS THE ANSWER TO THIS?

Answer 1

Do you mean "if y is inversely proportional to x²...?" 

If that is the case, then we have that 

y*(x²) = k, based on the definition of "inversely proportional".

So, we need to solve for k, by substituting 10 for y and 35 for x. We get that

10*(35²) = k; that is k = 12,250

Now, go back to the formula

y*(x²) = k and substitute for y and k. Then solve for x², and then solve for x. I leave this part to you.