Question

1. An airplane flying at an altitude of 32,000 feet
descends at a rate of 1,300 feet per minute. If
the plane descends for 15 minutes, what would
its altitude be in feet?

Answer 1

in 1 minute it descends 1* 1,300ft
in 2 minute it descends 2* 1,300ft = 2600ft
in 3 minute it descends 3* 1,300ft = 3900ft

in 15 minute it descends ??ft

once you know how much it has descended you can know what the height is

Answer 2

Thanks so much, it makes sense clearly.