What is the m∠1? 21° 42° 71° 82°

The correct answer is 71, correct on        e d g e n u i t y.

Step-by-step explanation:

Can i please get brainlist?

71

Step-by-step explanation:

got it right on edge

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