Salomon swims diagonally across his pool every day. If Salomon’s pool is 4 meters wide and 16 meters diagonally across, how long is his pool, to the nearest tenth of a meter?

I'm not sure but i think it's 1670km/h

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.