A geologist studying the earth’s crust measured the temperature at 3 km below the surface. He found that the temperature had increased by 60 degrees Celsius compared to the surface. At what rate is the temperature increasing? Show your work.

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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.