Step-by-step explanation:
17. 21⁰ + 31⁰ + ?⁰ = 180⁰
= ?⁰ = 128⁰
18. ?² = 12² + 5²
? = √169
? = 13 TYPO
Answer:
17: 12818: 13
17: 21 + 31 = 52, 180 - 52 = 128.18: a² + b² = c². 5² = 2512² = 14425 + 144 = 169169 square rooted = 13C (aka the missing side) = 13edited to fix 17 from 121 to 128
