Express the area of the entire rectangle

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

In a rectangle klmn, km = 6x + 16 and ln = 49. find the value of x

What is the surface area of a cube with the volume of 729 ft?