The Chang family is on their way home from a

cross-country road trip.

During the trip, the

function

D(t) = 2,280 - 60t can be

used to model their

distance, in miles, from

home after t hours of

driving.

Find D(15) and interpret

the meaning in the context

of the probieu.

If DC) = 1,200, find the

value of ĉ and interpret its

meaning in the context of

the problem.