Sara took a taxi home from work. The taxi fare was $2.10 per mile, and she gave the driver a tip of $5. Sara paid a total of $49.10. Find the distance between the airport and Sara’s home.\

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.