Can someone help me with this question please

An architect is designing a water fountain for a park she uses the given function to model the water jet flowing from the fountain nozzles where h(x) gives the height of the water jugs in feet x feet from the starting point h(x)=-1/20x+x+15

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Find the missing dimension! need asap! tiny square is a =3025 in ²