$810 !! hope this helps :)
Answer:
C = 10
Step-by-step explanation:
Find the last side of the triangle using the Pythagorean theorem.

You have a and b already, a = 6, b = 8

solve this to get

C = 10
Apply the same to the other 2 triangles. C is your longest side!
I mean, this isn't a question but its true?
Answer:
Nine is 76, no clue about eight
Step-by-step explanation:
Melanie walked 2.2 miles. Cathy walked 1.75 times as far. This means that you need to do 2.2 * 1.75 which equals 3.85. To find how much further, do 3.85 - 2.2 which equals 1.65. Therefore Cathy walked 1.65 more miles than Melanie.