polygon with points A (4,8) B (6,8) C (8,5) D (2,5) reflect ABCD over the y+-x, then rotate is 90 degrees clockwise about the origin. What are the coordinates for A"B"C"D".

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

3000000000000000000000

good luck on ur quiz test or homework. have a good day : )