look at the units. You have
mi/gal
mi/hr
You want to use those to end up with miles in terms of hours.
mi/hr * hr = mi
d(t) = 65t
mi/(mi/gal) = gal
n(d) = d/25
d(t) is miles driven in t hours
n(d) = gallons used in d miles
= gallons used in t hours.
(n◦d)(t) = n(65t) = 65t/25
n times d makes no sense
gallons * miles = ??
ok, so I need to come up with an answer for this question-
A car traveling 65mph on the hwy gets 25 miles per gallon.
Write the function that represents the distance d(t) in miles that the car travels in t hours.
*Then,
Write a function that represents the number of gallons of gas n(d) used for d miles of travel.
*Then,
Evaluate (n times d)(t).
*Then,
Evaluate (n times d)(5) using the solution from part 3
Im so confused!
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