a freight train is carrying goods across the country. the distance it has traveled varies directly with the number of gallons of fuel it has used. see the graph below.
(a) how many miles does the train travel per gallon?
(b) what is the slope of the graph?

so for b) its 200 miles for every 50 gallons

step-by-step explanation:

so the slope is y= 200x +50

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