6(840.25)+15(1,374.05)+9(1.222.43)/ 30

Choose the correct classification of 3x4 − 9x3 − 3x2 + 6. 5th degree polynomial 4th degree polynomial 9th degree polynomial 24th degree polynomial

What is the quadric regression equation that fits these data

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