49.5 is what percent of 33

Ten times the square of a non-zero number is eqaul to ninety times the number

The following division is being performed using multiplication by the reciprocal find the missing numbers is 5/12 divided by x/3 equals 5/12 times x/10 equals 1/x

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9