Simplify 2a2b3(4a2 + 3ab2 – ab) = ?
a. 8a4b3 + 6a3b5 + 2a3b4
b. 8a4b3 + 6a3b5 – 2a3b4
c. 8a4b5 + 3a3b5 + 2a3b4
d. 8a4b5 + 3a3b5 – 2a3b4
Find the value of x in the equation 2 x + 20 = 15 + 3 x .
a. –5
b. 16
c. 25
d. 1