Dan's car depreciates at a rate of 9% per year. By what percentage has Dan's car depreciated after 4 years?
Give your answer to the nearest percent.

21

step-by-step explanation:

, 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

answer

you start with $5 and save $10 a week until you have at least $45wer

step-by-step explanation:

i am not sure :

step-by-step explanation: