a fraction less than 5/6 and has a denominator of 8how do i figure this out?

Use the given information to determine the exact trigonometric value.

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

If a + b = 4, what is the value of |4 – a| + |4 – b|?