Question

33.For a car traveling at a constant speed, the distance driven, d

kilometers, is represented by d(t)=80t, where t is the time in hours. The
cost of gasoline, in dollars, for the drive is represented by C(d)=0.09d.
Evaluate C(d(10))

Answer 1

Given:

`d(t)=80t`

`C(d)=0.09d`

To find:

The value of
`C(d(10))`.

Solution:

We have,

`C(d(10))=C(80(10))`
`[\because d(t)=80t]`

`C(d(10))=C(800)`

Now,

`C(d(10))=0.09(800)`
`[\because C(d)=0.09d]`

`C(d(10))=72`

Therefore, the value of
`C(d(10))` is 72.