The Chang family is on
their way home from a
cross-country road trip.
During the trip, the
function
D(E)= 2,280 - 600 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 problem.
If D(t)=1,200, find the
value of £ and interpret its
meaning in the context of
the problem.

12cm

the answer is d

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for