Jane and jill want their mom to ride the roller coaster with them, but she thinks it will be too fast. she asks the girls to find out how fast the roller coaster will be traveling. they find out that the speed of the roller coaster, in miles per hour, is modeled by the function g(x) = x4 − 4x2 7x − 8, where x is time measured in seconds. how fast is the roller coaster traveling at 2 seconds? 6 miles per hour 22 miles per hour 26 miles per hour 54 miles per hour