Simplifying, Evaluating Algebraic Expressions

Simplify:
-1x + y - z + 10z + 2x - 10y

• 1x - 9y + 9z

• 1x - 9z - 9y

• -1x - 9z - 9y

• -1x - 9 - 9y

Simplify the expression: -5(x + 4)

• 5x + 4

• -5x + 4

• -5x - 20

• -5x + 20

8y + 12 - 2z
for y = 4 and z = 2

• 40

• 20

• 84

• 34

6 (x + 5)

• Six times X increased by five

• Six times the sum of a number and five

• The quotient of six and a number increased by five

• Five more a number times six

Evaluate when a = 15:
2(a - 5) + 2

• 22

• 27

• 14

• 7

Evaluate the expression when x = 3. 
2x² - 5

• 31

• 12

• 7

• 13

a² - b²
Evaluate if a=4 and b =2

• 4

• 20

• -4

• 12

3(2x + z) when x=8 and z=2

• 12

• 30

• 54

• 60

Simplify by combining like terms:
5a + 2b - 3a + 4

• 8a + 2b + 4

• 2a + 2b + 4

• 8ab

• 4ab + 4

Which number is the coefficient?

6f² - 9

• 6

• f

• 2

• 9