Answers are: choice #2 (3/7)
and choice #1 (2/3)
Step by step, see also the attachment
When adding or subtracting fractions, we know the denominator (bottom number) has to be the same and then we either add or subtract the numerator (top number). The bottom number is how many parts there is in a whole, like a pie.
5/7 - 2/7
5-2 = 3
Answer is 3/7
1/3 + 1/3
1 + 1 = 2
Answer is 2/3