Adiver is 25 feet below sea level. after he swims up 15 feet towed the surface, what is his elevation?

Answer[:]
The Diver Is 10 Feet Below Sea Level

The diver is 25 feet below sea level. Then he swims 15 up toward the surface. We can do 25 - 15 = 10. His elevation is 10 feet below sea level.

Answerer

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.