Suppose y varies directly with x. write an equation relating x and y. y = 7.5 when x = 10

There are 12 boy and13 girls in a class. if the teacher randomly chooses a student’s name out of a hat what is the probability it will be a girl

The inside wheels of a car traveling on a circular path are rotating half as fast as the outside wheels. the front two wheels are six feet apart. what is the number of feet in the path traced by the inside front wheel in one trip around the circle? express your answer in the form "k \pi", where k is an integer.

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way