8. Which pair of ratios is proportional? A. 3: 25 and 5 : 50
B. 6 in.: 8 min and 3 min : 2 in.
C. 6 yd : 10 mi and 18 yd : 30 mi
D. 3 ft : 8 sec and 5 ft : 11 sec

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

its a straight line parallel to the time axis

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