To find: the expression which cannot be used to find the total amount he charges
Answer to Problem 41STP
Only expression that cannot be used is option B.
Explanation of Solution
Given:
First three hours, he charges
For each additional hour, he charges
He played for 7 hours.
Option A:
Option B:
Option C:
Option D:
Calculation:
Now, the amount that he will charge will be
Thus, the expression for total charge is
That is his total charge should be sum of three times
Option A:
This is exactly same so, this expression can be used.
Option B:
Now,
This expression can't be used as it is not same as (1)
Option C:
Now,
This is same as (1), so this expression can be used.
Option D:
Since we know that
This is same as (1), so this expression can be used.
Conclusion:
Thus, only expression that cannot be used is option B.
Chapter 1 Solutions
Pre-Algebra, Student Edition
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