which parachute has a slower descent:a red parachute that falls 20 feet in 8 seconds or a blue parachute that falls 24 feet in 12 seconds?

We need to find the descent of feet per sec.

To find this, use the same thing as miles per hour

Distance / time=speed

Red: 20:8=2.5m/s

Blue:24:12=2m/s

Therefore the blue one descends the slowest

Find the unit rate of each by dividing distance by time:

20 / 8 = 2.5 feet per second

24/12 = 2 feet per second

The blue parachute is falling slower.