On the freeway, it is unsafe to drive too slowly or too quickly. The safest driving speeds on the freeway near Allan’s town were scientifically determined to be between the minimum and maximum speeds (in miles per hour) according to the equation start absolute value x minus 55 end absolute value is equal to 4 point 2 Which equation can be used to determine the maximum safe driving speed?
Answer
A
x minus 55 is equal to negative 4 point 2
B
x plus 55 is equal to negative 4 point 2
C
x minus 55 is equal to 4 point 2
D
x plus 55 is equal to 4 point 2
Explanation
The equation |x − 55| = 4.2 means the safe speeds are 4.2 miles per hour away from 55. The two boundary speeds are 55 − 4.2 and 55 + 4.2, so the maximum comes from x − 55 = 4.2. Therefore, choice C, “x minus 55 is equal to 4.2,” determines the maximum safe speed.
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