I need help with this

100 points, hi, i’m not sure what to do here,the data doesn’t seem to be quadratic .? can anyone me, in advance

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

If f(x) = 3x2 - 2x+4 and g(x) = 5x + 6x - 8, find (f-g)(x).