Explanation

To add these fractions, we need to find a common denominator, which is 77 (7 x 11). So, we'll convert both fractions to have a denominator of 77:

(3/7) = (3 x 11) / (7 x 11) = 33/77

(6/11) = (6 x 7) / (11 x 7) = 42/77

Now, we can add:

33/77 + 42/77 = 75/77

To convert this to a decimal, we'll divide the numerator by the denominator:

75 ÷ 77 = 0.974 (approximately)

So, the correct answer is: 0.97