Answer:
Note that  :
:
Once:  


Therefore, the answer is letter B
 
        
             
        
        
        
The exact form of 8 3/8, is 67/8 Decimal Form: 8.375 & Mixed number: 8 3/8
        
             
        
        
        
He can read  chapters of his history book in 1 hour.
 chapters of his history book in 1 hour.
<em><u>Explanation</u></em>
Franco read 3/8 of a chapter of his history book in 1/5 of an hour. 
Suppose, he can read  chapters of his book in 1 hour at this rate.
 chapters of his book in 1 hour at this rate. 
So, the equation according to the <u>ratio of 'the chapter to the time'</u> will be....

So, he can read  chapters of his history book in 1 hour.
 chapters of his history book in 1 hour.
 
        
             
        
        
        
We can suggest this equation.
(6x+x)+(6x+x)+110º+110º=360º
7x+7x+220º=360º
14x=360º-220º
14x=140º
x=140º/14
x=10º
Answer. x=10º
        
                    
             
        
        
        
Answer:
tan 4x
Step-by-step explanation:
Note the difference identity for tangent ratio is
tan(x - y) = 
Given
 ← in the form of the right side of the expansion, thus
 ← in the form of the right side of the expansion, thus
= tan(9x - 5x)
= tan 4x