<span>y-28/5 = 3/4 (x+21/5)!</span>
Answer: There are 646,646 different selections.
The library is going to select 10 books from a set of 22 books. There are a lot of different possibilities. This is a combination problem.
The standard notation is 22 C 10, this means that we are selecting 10 from 22 and the order doesn't matter. Most calculators will do this for you.
If you want to do the work by hand, evaluate: 22! / (10! x 12!)
Either way you will get 646,646 possibilities.<span />
Answer:
Given:
To find:
Step-by-step explanation:
Answer:
Length is 10
Width is 8
Step-by-step explanation:
The formula for the perimeter of a rectangle is:
We are told that the length l is 2 more than twice the width w. In other words:
Also, we are given that the perimeter is 28. Therefore:
Distribute:
Combine like terms:
Subtract 4 from both sides:
Divide by 6:
So, the width is 4.
And the length is 2 more than twice the width. Thus:
The length is 10.
And we are done :)