Final answer:
To add 2/7 and 1/10, find the least common multiple of the denominators, convert the fractions to have the same denominator, and then add the numerators. The answer is 27/70.
Step-by-step explanation:
To add 2/7 and 1/10, we need to find a common denominator. In this case, the least common multiple of 7 and 10 is 70. We then convert both fractions to have a denominator of 70.
So, 2/7 becomes 20/70 and 1/10 becomes 7/70. Now we can add the two fractions together: 20/70 + 7/70 = 27/70.
Therefore, the answer is a. 27/70.