Ttakes phillip 7 hours to proof a chapter of hawkes learning systems' intermediate algebra book and it takes kim 3 hours. how long would it take them working together? (round your answer to two decimal places.)

Ais the answer for your question

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.