Answer:
3(3x^3-8)
Step-by-step explanation:
3x^3+6x^3 = 9x^3 (you sure it's not 6x^2??)
if not then 9x^3-24
3(3x^-8)
BUT
if it's 3x^3+6x^2-24
then 3(x^3+2x^2-8)
^-^
90
90 * 70% = 63
a)6 hrs
b)faster
a) 9*2/3=6
5 ft(60 in) long
x=70
38+x+x+2=180
40+2x=180
2x=140
