Order of Operations, Simplify Expressions, Evaluate Operations

Use order of operations to evaluate this algebraic expression.

What is the value of this expression? 
31 + 5² - 6

• 40

• 50

• 52

• 62

Evaluate when a = 15:

2(a - 5) + 2

• 22

• 27

• 14

• 7

What is the value of this expression? 
6² + 3

• 15

• 16

• 39

• 42

Simplify the following:

(2 + 7 - 1) ÷ 2²

• 16

• 2

• 72.25

• 8.75

Simplify the following:

-2 x (3 + 8 ÷ 4)²

• -16

• 1.375

• 4

• -50

Find and explain the error

• Division error

• Subtraction was done first when division should have been done first

• Division was done first when subtraction should have been done first

• Subtraction error

• 28

• -13

• 29

• -43

8 + 2 ⋅ 7

• 22

• 70

• 20

• 42

Simplify the expression: 2x + 1 + 7x 

• 10x

• 10

• 9x + 1

• 9 + 1x