Math 6 - Chapter 7: Algebraic Expressions

Write an algebraic expression for each of the following: A number that is 5 more than twice x.

• 5 + x

• 2 (5 + x)

• 2x + 5

• none of those

Write an algebraic expression for each of the following: The total cost, in dollars, of 4 pencils and 5 pens if each pencil costs w cents and each pen costs 2w cents.

• 13w cents

• $\frac{7w}{50}$

• $14w

• none of those

Write an algebraic expression for each of the following: The length of a side of a square whose perimeter is r units.

• 4r units

•  $\frac{r}{4}$ units

•  $r^2$  units

• none of those

Write an algebraic expression for each of the following: The perimeter of a rectangle whose sides are of lengths (3z+2) units and (2z+3) unit.

• (10z+10) units

• (6z+4) units

• (4z+6) units

• (5z +5) units

Evaluate each expression for the given value of the variable.

• 18

• none of those

• 16

• 17

Evaluate each expression for the given value of the variable.

• 23

• none of those

• 39

• 33

Simplify each expression.

• 26k

• 29k +15

• 19k + 7

• 19k - 7

Simplify each expression.

• 13 + 21h

• 9h + 13

• 21h + 4

• none of those

Expand each expression.

• 5m + 31

• 7m + 31

• 7m + 16

• none of those

Expand each expression.

• 29x + 22

• 29x + 38

• 13x + 38

• none of those