Given sin x=13/85 and tan x=13/84 . What is the ratio for cos x?

Enter your answer in the boxes in the simplest form.

40 points

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad