Answer:
The number is 60
Step-by-step explanation:
Answer:
a) 1680
<em>The number of ways to listen to four CDs from a selection of 8 CDs = 1680</em>
Step-by-step explanation:
<u><em>Explanation:-</em></u>
Given data the number of CD' s n = 8
<em>We have to selected '4' CD' s from total '8' CD's</em>
<em>By using permutations </em>
<em>The number of ways to listen to four CDs from a selection of 8 CDs.</em>
<em> = </em>
<em> </em>
<em> we know that </em>


<em>The number of ways to listen to four CDs from a selection of 8 CDs = 1680</em>
Answer: first option
Step-by-step explanation:
The volume of a regular pyramid can be calculated with the following fromula:

Where B is the area of the base of the pyramid and h iis the height of the pyramid.
The base is a square, therefore, its area B is:

You know that the height is 3, therefore, you can substitute these values into the formula.
THerefore, the volume of the pyramid is:

