Can someone help me?

Given f(x)= 9x+1 and g(x)=x^3, choose the expression (f*g)(x)

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

If two angles of a triangle have equal measures and the third angle measures 90°, what are the angle measures of the triangle? a. 60°, 60°, 60° b. 45°, 90°, 90° c. 30°, 30°, 90° d. 45°, 45°, 90°