Evaluate Expressions Pre Algebra

Evaluate the expression: 8 - x when x = 3.8

• 5.8

• 5.2

• 4.8

• 4.2

Evaluate the expression: x/5 when x = 80

• 12

• 14

• 16

• 18

Evaluate the expression: 120/x when x = 3

• 60

• 40

• 30

• 10

Evaluate the expression: ¾ x when x = 12

• 6

• 8

• 9

• 10

Evaluate the expression: x + ⅓ when x = ⅔

• 1

• 3

• 4/3

• 1/3

Write the power represented by "seven cubed"

• 7³

• 7²

• 7⁴

• 7¹

• -25

• 25

• 16

• -10

Answer explanation

 $\left(5\cdot-1\right)^2$  

 $=\left(-5\right)^2$  
 $=25$  

• 16x + 11

• 16x

• 24x + 41

• 4 - 24x

Answer explanation

Apply the Distributive Property by multiplying both terms inside the parentheses by 8.
 $8\left(2x+3\right)-13$  
 $=\ 16x+24-13$  
There's only one  $x$  term:  $16x$  
Combine all constants:  $24-13=11$  
Rewrite all terms together as one expression:  $16x+11$  

• 2x + 12y

• -12x + 6y

• 12x + 12y

• 2x - 6y

Answer explanation

Apply the Distributive Property. $1\left(-5x+9y\right)+1\left(7x+3y\right)$  
 $=-5x+9y+7x+3y$  
Combine all  $x$  terms:  $-5x+7x=2x$  

Combine  $y$  terms:  $9y+3y=12y$  

Rewrite all terms together as one expression:  $2x+12y$  

• 8

• -15

• -3

• 3

Answer explanation

 $2\cdot-3+9$  

 $=-6+9$  
 $=3$