Help! What is the answer for all of them??!

What describes horizontal cross section of the right rectangle 6m 8m 5m

Which of the following quartic functions has x = –1 and x = –2 as its only two real zeroes?

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