I need help with the answer

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

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

Write as a product of two polynomials. 2(3–b)+5(b–3)^2