Is 1/4 the answer to this what ratio forms a porportion with 8/36

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)