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Allen is running a marathon. He would like to finish the race in under 5.5 hrs. He has already run 3 hrs. The inequality 3+t<5.5 represents the situation.

Which number line shows how much longer Allen can run and still meet his goal?

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.