Answer:
20
Step-by-step explanation:
The answer is 20.
Steps to solve:
3x * (7 * x)
~Simplify
3x * 7x
~Combine like terms
21x
Best of Luck!
Bar chart
easier to understand
9, 10
9² = 81
10² = 100
yes
the variable cannot have a negative symbol, unless it has no number.
