Find (h*g)(x). h(x)3x-3 and g(x)=x^2+3
a.3x^3 -9
b.3x^3 -3x^2 +9x -9
c.3x^3-3x^2+9x
d. x^3+3x^2+9x-9

Long division setup showing an incomplete calculation. 12 is in the divisor, 6839 is in the dividend, and 5 hundreds and 6 tens is written in the quotient. 6000 is subtracted from 6839 to give 839. an unknown value represented by a box is being subtracted from 839. what number should be placed in the box to complete the division calculation?