Asap (preferably before tomorrow) 7th grade math a.) today the canyon’s deepest part is 5,500 m from the edge to the river. assuming that it took about 5 million years to form at a constant rate, what was the rate of erosion in millimeters (mm) per year? b.) use this rate of erosion to create an equation that can be used to calculate how many millimeters the canyon will grow in any number of years (y), where x represents the number of years. c.) use your equation to solve for how many millimeters the canyon will grow from 2014 to the year 3000.