Answer:
Step-by-step explanation:
a²+b² = c² c is always the longest line thats opposite to the 90 degree angle
for 1
15² + b² = 17²
b² = 17² - 15²
b = √(17² - 15²)
b= 8
84 in I believe? (Im sorry im not much help)
15 x 5 = 75
35/75 + 30/75 = 65/75
(65/75) / 5 = 13/15