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-41m + 2] + 9 = 5
m =
X
Enter a mathematical expression.
William is driving from Yakima, Washington, to Salt Lake City, Utah. The gas mileage in miles per gallon for William’s car can be modeled by the function
m(s)
=
11s
55] + 24
where m is the gas mileage for William’s car when he is driving at an average speed of s miles per hour, for speeds between 40 and 80 miles per hour. At what speed should
William drive to get gas mileage of 20 miles per gallon during his trip? (Include units with your numerical answers and list the smaller value first.)
William should travel at an average speed of
or
On William’s trip from Yakima, Washington, to Salt Lake City, Utah, he will pass through Boise, Idaho. William’s distance from Boise can be modeled by the function
D(t) = 1365 – 80t||
where D(t) is William’s distance in miles from Boise after driving for t hours. Find the time when William will be 50 miles away from Boise. (Include units with your numerical
William will be 50 miles away from Boise after
and again after

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