5. A surveyor is 100m from a building. He finds the angle of elevation to the top is 23°. If his eye level is 1.55m above the ground, find the height of the building,

Hnmmmn not sure

The correct answer is $90

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.