Total the number of tenth graders: 12 + 14 + 8 = 34 total.
Now divide the number of tenth graders who speak Spanish by the total number of tenth graders:
12 / 34 = 0.3529
Multiply the decimal answer by 100 to get the percent:
03529 x 100 = 35.29%
Round to the nearest tenth = 35.3%
The answer is the first choice.