Which would cost less and by how much you and your friend go to theater x and buy adult tickets,

drinks and popcorn, or you and your friend rent a video for $3.50 and buy a 2 liter of cola ($1.60) and

a bag of microwave popcorn ($1.98)?

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

if x decreases by 4 then y increases by 10

step-by-step explanation: