Use for question 17-18: The distance around a circle is 20.5984 inches.
1
17) What is the radius the circle?
18) What is the area of the circle?

I'm really sorry

Step-by-step explanation:

I'm just so sorry...

The part of the video that was not of his children is:

         85 minutes    OR   1 hour and 25 minutes.

It is given that:

Ali was reviewing his family video.

The tape totaled 2 hours and 37 minutes.

Now we know that:

1 hour=60 minutes

This means that:

2 hours=2×60 minutes

i.e.

2 hours= 120 minutes

Hence, 2 hours and 37 minutes= 120+37 minutes

i.e.

2 hours and 37 minutes= 157 minutes.

Video of his children totaled 72 minutes.

This means that the part of the video not of his children is:

Total time of video-Time of video of his children

=  157-72

= 85 minutes or 1 hour and 25 minutes