PLEASE HELP ME!! PERSON WHO GETS ALL RIGHT WILL BE MARKED AS BRAINLIST !!! (please look at image)

a computer store offers customers a protection plan when they a buy a computer. a research company determines that for every 5$ increase in the price of the plan, the store will sell 3 fewer plans per month. please answer the following questions given in the image .

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

idk

step-by-step explanation:

i think u have 12 apples sorry again i don't really know if it correct i'm just tryna hrlp people out.