Answer:
81
Step-by-step explanation:
First, you combine like terms using PEMDAS
5+4 * (2+7)
5+4 * (9)
9 * 9
9 * 9 = 81
When multiplying numbers, it doesn't matter which number is first or second.
The correct answer is: Commutative Property of Multiplication
The correct answer is the square root of 6.5