The science club is inflating a model of a hot air balloon. the graph below shows their progress. at what rate is the diameter increasing?

12.5 centimeters per minute

Step-by-step explanation:

From the graph, the rate at which the diameter increasing would be inthe units of cm/min

The rate is basically the slope of the line. The slope (m) has formula:

Where

 is any point from the graph

and

 is another point from the graph

Let's take the origin (0,0) as the first point and (4,50) as the second point. Now lets calculate the slope:

Thus, we can say:

The diameter of the hot air balloon is increasing at a rate of 12.5 centimeters per minute

$450 is the answer.

step-by-step explanation:

30% of 450 = 135

450-135=315