A driving test has three stages. Learner drivers must score over 70% on each stage to pass. If Max’s test scores are 11/20, 42/50 and 17/23, did he pass?

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.