Share out £80 between tom and jerry in the ratio 3: 2

So let's add variables according to the ratio:
3n + 2n = £80
5n = £80
n = 16
3(16):2(16)
48:32
Tom gets £48, and Jerry gets £32

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.