Answer:
6.32
Step-by-step explanation:
To find the side length on a right angled triangle we follow The Pythagorean Theorem:

c being the hypothesis (longest side: the hypotenuse is always opposite the right angle)
so..


I believe it's 7.5 but I could be wrong.
Answer:
4x-4
Step-by-step explanation:
x-10+3x+6=4x-4
Hope helps :3