Whoever is looking at this, please help me. i'll give you 19 points!

c² = a² + b² - 2 a b cos C

2 a b cos C =  a² + b² - c²

cos C = (a² + b² - c²) / 2ab

C = arccos( (a² + b² - c²) / 2ab )

C = arccos( (17² + 8² - 16²) / (2 (17)(8) ) )

C ≈ 69.11°

69.1

d. 8

step-by-step explanation:

the given radical expression is:

we can rewrite this as:

we express as square numbers to get;

the exponents will now cancel out to give.

the correct answer is d

111

step-by-step explanation: