Matthew's wage is £320 per week. He spends 5/8 of his wage on food. 5% goes on the household bills and the rest is saved. How much does Matthew save each week?

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.