Answer:
The midpoint is 5
Step-by-step explanation:
we know that
The formula to calculate the midpoint between two numbers is

we have

substitute



therefore
The midpoint is 5
19.99+0.21x=52.54
0.21x=32.55
x=155
Mr. Sidney drove 155 miles
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21 times 100 divided by 70 =30
Quotient means to Divide so we are gonna divide y and 7.
The Answer is Y/7.