2/3 + -1/16= what is the fraction?

Find a common denominator for the two fractions to be able to combine them.
Let's use 48.

Multiply both parts of 2/3 by 16, then multiply both parts of -1/16 by 3.
32/48 + -3/48

This is the same as subtracting the second fraction from the first, so let's write it like that.
(32-3)/48
29/48

Since 29 is a prime number, the fraction cannot be reduced, so that is the final answer.

b 21%

Step-by-step explanation:

good luck and hurry :)