I need help guys please

7.2

Step-by-step explanation:

I used Thales theorem to solve it. If you want to understand it, type "Thales theorem" in google and you will get more explanation about it.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.

Well is there a picture