When weighing out media, Mary weighs out 15.0 g of Diſco Agar on a balance that reads to the nearest 0.01 g. What is the uncertainty of this value ? b) One day the balance breaks and Mary is given a new balance that measures to the nearest gram, i. e. the balance will read 15 g. what is the uncertainty of the new balance ?

The answer for this question is 80

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.