Solve! ( giving out more points ; ) 4c + 2c + c = 266**i'd like to see step by step material pls! **

All you have to do is add the like terms.
(They are all like terms, so just add everything)

4c + 2c + c
6c + c

= 7c

Now we know that
7c = 266

We need to isolate c in 7c, to do that we will eliminate 7.

Eliminate it by dividing 7.
7c ÷ 7 =
[property of equality - also divide 7 on the other side since you are making changes to this side]

7c ÷ 7 = 266 ÷ 7

c = 38 [final answer]

♧

This polygon has 4 sides
180(4-2) = 180(2) = 360 degree
80+90+2x + 3x = 360
170+5x = 360
5x = 190
x= 38
measure of angle t is 2(38)= 76
the answer is c. trust me
hope this !