Pre-test
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what is the value of y in the equation 6,4x + 2.87 = 44.4. when x= 3?
y = 5
y = 6
v = 8
y=9

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

need more information

step-by-step explanation:

hi! i think the answer is 1/2 : )