Answer:
Its A. 
Step-by-step explanation:
Edge 2021
 
        
                    
             
        
        
        
Answer:
i play game yes me do
Step-by-step explanation:
 
        
             
        
        
        
Answer:
a = 
Step-by-step explanation:
I think your question is missed of key information, allow me to add in and hope it will fit the original one.: 
<em>Suppose ABC is a right triangle with sides a, b, and c and right angle at C. Find the unknown side length using the Pythagorean theorem and then find the values of the six trigonometric functions for angle B. when b=3 and c=4</em>. 
My answer: 
We will Pythagoras theorem, which states that the sum of squares of two legs of a right triangle is equal to the square of the hypotenuse of right triangle. Because the question says that ABC is a right triangle. 

Given that: b=3 and c=4
 
so a =  
 
We know that tangent relates opposite side of a right triangle with adjacent side.
 
Please have a look at the attached photos. 
 
        
             
        
        
        
Explique melhor, se eu entender consigo te ajuda :)