Answer:
1. x = 20
2. x = 20
Step-by-step explanation:
1.
It is given that these two angles sum up to 90 degrees (denoted by the box, that can be seen on the larger angle that the two angles sum up to).
So form an equation:
x + 3x + 10 = 90
simplfiy,
4x + 10 = 90
inverse operations,
4x + 10 = 90
-10 -10
4x = 80
/4 /4
x = 20
2.
It is given that these three angles sum up to 180degrees, a straight angle is 180 degrees.
So form an equation,
3x + 80 + 2x = 180
simplify,
5x + 80 = 180
inverse operations,
5x + 80 = 180
-80 -80
5x = 100
/5 /5
x = 20
