Distribute
5 × 4n + 5 × -5
Simplify 5 × 4n to 20n
20n + 5 × -5
Simplify 5 × -5 to -25
<u>20n - 25</u>
Step-by-step explanation:
the sum of all angles in a triangle is always (ALWAYS !) 180°.
180 = 31 + 35 + x = 66 + x
x = 180 - 66 = 114°
Answer: