Answer:
2,160
Explanation:
for this problem, your going to use "P E M D A S" (parentheses, exponents, multiplication, division, addition, and subtraction).
x = 20 x (12 x 9) ← 12 x 9 first because its in parentheses
= 20 x 108 ← Now do this, because next you have to multiply
x = 2160