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10.7

Explanation:

The addition of 7.6 + 2.401 + 0.68 = is 10.681.

According to the addition of sig figs, you want your answer to have the same amount of places, after the decimal point, as the least sig-fig figure.

7.6

2.401

0.68

+

10.681 - Draw a line straight down from the least sig-fig figure (7.6)

So the maximum figure after the decimal point is one. Since 8 is greater than 5, you have to round up from 10.6 to 10.7.