Question

Can someone help and explain plz

Answer 1

180 - 69 
= 111
111 divided by 2 = 55.5
56.5 x 2 = 113 - 1 = 112
Answer: 56.5

Answer 2

90-69=21 degrees. This is our target answer. We'll write an equation to do this:
2x-1=21
Add 1 to each side to get:
2x=22
Divide by 2 to get that x=11

Plugging this in, we see that 2(11)-1+69=90, so our answer is correct.

:)