Daniela received \$30$30dollar sign, 30 as a birthday present and decided to save the money to buy a new video game console. From the following week onward, she added \$12$12dollar sign, 12 to her savings each week. Let f(n)f(n)f, left parenthesis, n, right parenthesis be Daniela's savings nnn weeks after her birthday.

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Step-by-step explanation:

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

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step-by-step explanation: