Saeed bought 21 and 1/2 lb. of ground beef. he used 1/4 of the beef to make tacos and 2/3 of the remainder to make a quarter pound burgers. how many burgers did he make?

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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.