Question

What's the answer ?????

Answer 1

We need to use the Pythagorean Theorem. The formula:

`a^(2) + b^(2) = c^(2)`
5^2=2^2+b^2
25=4+b^2
b^2=21
b=
`√(21)`
All you have to do now is to take the square root of 21.
You can find that out by using a calculator.

Hope this helps!