PLEASE HELP! it’s urgent!!

9514 1404 393

  x = 5

Step-by-step explanation:

Assuming the given expressions are supposed to be angle measures, their sum must be 180°.

  (14x +5) +(5 +20x) = 180

  34x = 170 . . . . . . . . . . . . . . subtract 10, collect terms

  x = 5 . . . . . . . . . divide by 34

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