How do you know whether two quantities x and y are proportional?

Acircle has a circumference of 28.36 units what is the diameter of the circle

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

What’s the answer ? use the picture to see the problem