How many two thirds ounce can be made with 8ounces

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

Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2 - 23 = 10x a. -1.93, 11.93 b. 1.93, -11.93 c. 1.93, 11.93 d. -1.93, -11.93

Ineed to know the answer to this algebra question.