Simplify 6a^2b^-2/8a^-3b^3

Nine more than four times a number is the same as one less than twice the number. find the number?

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

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.