7th- Unit 5 Review

Which of the following is NOT an expression?

• $4x$

• $\frac{4}{5}x\ +\ 8\ =\ 10$

• $7g\ +\ 8k\ -\ 2$

• $5\left(19x\ -\ 11n\right)$

 $7a\ +\ 9ax\ -\ 3a\ +\ 4ax$  

•  $10a\ +\ 13ax$  

•  $17ax$  

•  $13ax\ +\ 6a$  

•  $4a\ +\ 13ax$  

 $3\left(5\ +\ 2\right)$  

•  $21$  

•  $15\ +\ 2$  

•  $15\ +\ 6$  

•  $17$  

 $8\left(2x\ -\ 3\right)$  

•  $16x\ -\ 3$  

•  $2x\ -\ 24$  

•  $16x\ -\ 24$  

•  $16x\ +\ 24$  

 $8\left(5\right)\ -\ \left(2\right)3$  

•  $34$  

•  $46$  

•  $38$  

•  $32$  

The cost of grapes is $2.50 per pound and the cost of apples is $1.25 per pound. What expression would you use to find the total if you bough g, pounds of grapes and a, pounds of apples?

• $2.50g\ -\ 1.25a$

• $2.50g\left(1.25\right)$

• $g\ +\ a$

• 
  

  $2.50g\ +\ 1.25a$
  

Mr. Fatigante drove 5x - 10 miles and Mrs. Roseland drove 2x - 4 miles in the same day. What is the difference of their distances driven?

• 
  

  $3x\ -\ 6$
  

• $3x\ -\ 14$

• $7x\ +\ 14$

• $5x\ -\ 4$

How would you write the following as an expression: 4 times the number of studnets plus 10.

• x + 4

• 4x - 10

• 4x + 10

• 14x

Factor out the GCF of 10x - 20.

• 10(x -2)

• 10(x + 2)

• 10(x-20)

• 5(2x - 4)

Evaluate the expression if x = 8.

-7x + 23

• -79

• -33

• 79

• 33