What is 0.351 as a fraction

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

Extra points! find the missing dimension! need asap

Out of 50 students surveyed, 16 have a dog. based on these results, predict how many of the 280 students in the school have a dog.