PLEASE HELP ME KIND SOUL:
Pretty Please explain step by step!
THaNK YOUU!

1. 90 meters

2. 29.12

Step-by-step explanation:

Triangle equals 1/2bh

Square equals bh

Circle equals pi(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

the first one

step-by-step explanation:

just id the test.