In the diagram below, a large flagpole stands outside of an office building. Marquis realizes that when he looks up from the ground, 60 meters away from the flagpole, that the top of the flagpole and the top of the building line up. If the flagpole is 35 meters tall and Marquis is 170 meters from the building, how tall is the building?

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.