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Lesson 7: Evaluating expressions word problems

# Evaluating expressions with variables word problems

Learn to evaluate expressions in word problems to gain new information.
Evaluating an expression with one variableSee video transcript

### Reflection question

What was Sal finding when he plugged $t=10$ into the expression $5t+3$?

# Let's try a practice problem!

The expression $2m+10c$ gives the amount of money, in dollars, a dessert store makes from selling $m$ muffins and $c$ cakes.
How much money does the dessert store make from selling three muffins and four cakes?
dollars

# Challenge problem

Part A
A flower store uses the expression $2+5r$ to determine the cost, in dollars, of $r$ roses.
Complete the table to find the cost of different numbers of roses.
Number of roses $\left(r\right)$Cost $\left(2+5r\right)$
$3$$17$
$6$
$9$

Part B
Cam has 32 dollars. How many roses can he afford to buy?
Assume that he wants to buy as many roses as he can.

### Extra challenge

Explain to a family member, friend, or classmate why the cost of six roses is not double the cost of three roses.