For this, you will be doing the pythagorean theorem, which is . In this case, the legs are 12 and 35 and the hypotenuse is AB. Using this, the equation will look like this:
Firstly, solve the exponents:
Next, add up 144 and 1225:
Lastly, square root each side, and your answer should be
In short, the hypotenuse is 37 ft, or the last option.