Jack estimates that the cost per mile, in dollars, for operating a certain truck is between 15% and 21% of the number of miles d
riven. This is shown by the system of inequalities below, where x represents the number of miles driven and y represents the cost of operating the truck. y ≥ 0.15x
y ≤ 0.21x
Based on this information, which statement is true?
A) If Jack drives over 15 miles, it will cost 15 · 0.15 to operate the truck.
B) If Jack drives less than 21 miles, it will cost 21 · 0.21 to operate the truck.
C) If Jack drives the truck 100 miles, it will cost either $15 or $21.
D) If Jack drives 200 miles, it will cost anywhere between $30 and $42.
D) If Jack drives 200 miles, it will cost anywhere between $30 and $42
Step-by-step explanation:
The cost is said to be a range of possibilities. The first three answer choices seem to assume the cost is at one extreme or the other. They incorrectly interpret the statement of cost.
All you have to do is divide 72 by 90n and it will give you .8, move the decimal two places to the right to give you 80 and subtract 80 from 100 to get 20
