What problem do you set up to find x and y

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

Which of the following exponential functions goes through the points (1, 6) and (2, 12)? f(x) = 3(2)x f(x) = 2(3)x f(x) = 3(2)−x f(x) = 2(3)−x

Yvaries inversely as x. y =12 when x=5. find y when x=4