
Concept explainers
(a)
To write: the expression for the total amount of money he earned
(a)

Answer to Problem 9STP
The required expression is
Explanation of Solution
Given:
D earned $18
Yesterday, he mowed 3 lawns
Today he mowed 4 lawns.
Calculation:
To find the amount of money D earned, multiply the amount he charges per lawn by the total number of lawns mowed.
The amount he earned can be expressed as
Conclusion:
Therefore, the required expression is
(b)
To find: the total amount he earned.
(b)

Answer to Problem 9STP
He earn together
Explanation of Solution
Given:
D earned $18
Yesterday, he mowed 3 lawns
Today he mowed 4 lawns.
Calculation:
Apply distributive property,
He earn altogether
Conclusion:
Hence, he earn together
Chapter 4 Solutions
Pre-Algebra Student Edition
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