My other answer was was lacking (I also believe I should have furthermore edited it.), therefore I will attempt to explain the steps correctly this time. I don't know what exactly is requested nor what you are learning, but I suspect it would be combinations, factorials, and/or permutations, something along those lines. Firstly I figured out my answer using factorials. 
FROM: F,R,O,M. This obtains 4 letters.
4! (1 x 2 x 3 x 4)= 24 
I am unsure if this is what you are looking for though. I hope this helped a bit.
        
             
        
        
        
Should be about $12.00-$20.00 less
        
             
        
        
        
Answer:
40 cubic inches
Step-by-step explanation:
The Formula for Volume: Length x Width x Height (L x W x H)
4 times 2 times 5 = 40
 
        
             
        
        
        
Given:
A right angle triangle ABC, right angled at C.
To find:
The measure of θ.
Solution:
In a right angle triangle,

In triangle ABC,



It can be written as


Therefore, the measure of θ is 28.369.