Iris is heading a recycling drive. The chart below gives the number of kilograms of each kind of recycling brought to the drive.

=3\,\text{kilograms}=3 kilograms equals, 3, start text, k, i, l, o, g, r, a, m, s, end text

How many kilograms of recycling have been brought to the drive in all?

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.

Really long apparently