A cottage has a gable roof. To the nearest foot, how wide is the cottage?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?

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

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?