On a blueprint, the scale indicates that 4 cm represents 12 ft. What is the length of a room that is 5cm long and 3.5 cm wide on the blueprint? The length of the room is
feet

5\16 x 2\5 = 10/80simplify to 1/80

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.