A roller coaster at a theme park takes fans on an exciting ride. In the first 20
A roller coaster at a theme park takes fans on an exciting ride. In the first 20 seconds, it carries passengers up a 30-meter hill, plunges them down 30-meters, and takes them back up a 15-meter rise. How much higher or lower from the start of the ride are they after these 20 seconds?
step-by-step answer extremely needed please:)!