Find the perimeter of the figure. round your answer to the nearest tenth. figure abcde is shown. a is at 6, 0. b is at negative 4, 5. c is at 2, 5. d is at 2, 9. e is at 6, 9. answer choices are: a. 41 units b. 34.2 units c. 23 units d. 11.2

can you give me more detail on this! ?

step-by-step explanation:

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