Jack’s Aunt gave him $3,000 to save until he starts college in four years. His Aunt agreed to pay him an additional 6.5% simple annual interest on the $3,000. How much interest will Jack’s Aunt have given him at the end of 4 years.

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb

answer: okw

step-by-step explanation:

what is the original number? you forgot to add it.