Ralph opens a saving account with 100 dollars he adds 20 every month. how would you make this proportional?

An astronaut drops a rock into a crater on the moon. the distance, d(t), in meters, the rock travels after t seconds can be modeled by the function d(t)0.82. what is the average speed, in meters per second, of the rock between 5 and 10 seconds after it was dropped?

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?