Evaluating expressions with variables word problems

Learn to evaluate expressions in word problems to gain new information.

ಖಾನ್ ಅಕಾಡೆಮಿ ವೀಡಿಯೊ ರಾಪರ್

Evaluating an expression with one variableSee video transcript

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

Let's try a practice problem!

The expression

2 m + 10 c

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

Part A

A flower store uses the expression

2 + 5 r

to determine the cost, in dollars, of

r

roses.

Complete the table to find the cost of different numbers of roses.

Number of roses $(r)$ ‍	Cost $(2 + 5 r)$ ‍
$3$ ‍	$17$ ‍
$6$ ‍	Your answer should be $6$ ‍ ನಂತೆ ಪೂರ್ಣಾಂಕ. $3 / 5$ ‍ನಂತೆ ಸರಳೀಕೃತ ಶುಧ್ದ ಭಿನ್ನರಾಶಿ $7 / 4$ ‍ ನಂತೆ ಒಂದು ಸರಳೀಕೃತ ಶುಧ್ದ ಭಿನ್ನರಾಶಿ $1 3 / 4$ ‍ ನಂತೆ ಒಂದು ಸರಳೀಕೃತ ಮಿಶ್ರ ಭಿನ್ನರಾಶಿ $0.75$ ‍ ನಂತೆ ಒಂದು ಪೂರ್ಣ ದಶಮಾಂಶ $12 ಪೈ$ ‍ or $2 / 3 ಪೈ$ ‍ನಂತೆ ಪೈನ ಗುಣಕ
$9$ ‍	Your answer should be $6$ ‍ ನಂತೆ ಪೂರ್ಣಾಂಕ. $3 / 5$ ‍ನಂತೆ ಸರಳೀಕೃತ ಶುಧ್ದ ಭಿನ್ನರಾಶಿ $7 / 4$ ‍ ನಂತೆ ಒಂದು ಸರಳೀಕೃತ ಶುಧ್ದ ಭಿನ್ನರಾಶಿ $1 3 / 4$ ‍ ನಂತೆ ಒಂದು ಸರಳೀಕೃತ ಮಿಶ್ರ ಭಿನ್ನರಾಶಿ $0.75$ ‍ ನಂತೆ ಒಂದು ಪೂರ್ಣ ದಶಮಾಂಶ $12 ಪೈ$ ‍ or $2 / 3 ಪೈ$ ‍ನಂತೆ ಪೈನ ಗುಣಕ

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.

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

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ಇನ್ನೂ ಪೋಸ್ಟ್‌ಗಳಿಲ್ಲ.