Question

...

Answer 1

Pyhtagoras Theorem.

\[Hypotenuse^2=Side1^2+Side2^2\]

Answer 2

use pythagorean's theorem... \[\LARGE a^2+b^2=c^2\]

\[\Large 4^2+b^2=(8.5)^2\]

Answer 3

so it's 7.5

Answer 4

\[\sqrt{8.5^2-4^2}\]
\[\sqrt{72.25-16}\]
\[\sqrt{56.25}\]
7.5<----answer