A train travels at a rate of 70 mi/h. Two hours after leaving the station it is 210 miles from its destination.

y - 210 = 70(x - 2)

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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

answer: the up tack or falsum is a constant symbol used to represent a logical constant denoting "false" in logic.