During another part of its flight the balloon in exercise 10 had a change in elevation of -901 feet what was its rate of descent (exercise 10) a hot air balloon begins its descent at a rate of 22 1/2 per minute. how long will it take for the balloons elevation to change by -315 feet?

14 minutes

Step-by-step explanation:

velocity is defined as:

velocity = distance/time

The distance travelled by the balloon is 315 feet

Its velocity is 22.5 feet/min

Isolating time in the equation and replacing with data we get (dimensions are omitted):

time =  distance/velocity

time =  315/22.5

time = 14 minutes

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."