The most common men’s shoe size in the U. S. is reported to be 10 1/2. A shoe store uses a table like the one below to decide how many pairs of size 10 1/2 shoes to buy when it places a shoe order from the shoe manufacturers. What is the ratio of the number of pairs of size 10 1/2 shoes the store orders to the total number of pairs of shoes being ordered?

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

do your own work and don"t cheat.

step-by-step explanation:

5

step-by-step explanation: