Item 8

Question 1

In June, a runner ran a mile in 7:45. In September, the runner ran a mile in 5:51.

Is the percent of change in time an increase or a decrease?

response - correct

Increase

Decrease

Question 2

Find the percent of change from June to September. Round to the nearest hundredth of a percent.

The percent of change is about

%.

So, I didn't quite understand your question clearly, but I'll try my best to answer it.

So, the first question is quite simple: Did the runner have a % decrease in his time or an increase.

Well, 7:45 is minor than 5:51. So, his time decreased.

2nd question:

The percent of change. Well, first things first 7:45 has 2 different units, wich are minutes and seconds, I suppose. Same goes for 5:51.

So let's put everything in seconds. multiply both the 7 and 5 for 60 (for every minute has 60 seconds.)

That means:

7*60 = 420+45 = 465.

5*60=300+51=351.

Now, let's do the math itself:

465 - > 100%

351 - > x%

Is equal to about 75,5%

How much did it decrease then?

(75,5-100) % = 24,5%, approximately