Yes it is always true a biconditional statement is defined to be true whenever both parts have the same truth value.
        
             
        
        
        
Answer:
markup=62 %
Step-by-step explanation:   
 
        
                    
             
        
        
        
Answer:
$11 and $16
Step-by-step explanation:
let x be the cost of a student ticket then an adult ticket is x + 5 , then
3x + 7(x + 5) = 145 , that is
3x + 7x + 35 = 145
10x + 35 = 145 ( subtract 35 from both sides )
10x = 110 ( divide both sides by 10 )
x = 11
Student ticket costs $11 and adult ticket = x + 5 = 11 + 5 = $16
 
        
             
        
        
        
At first glance the answer seems like 3
u should draw it out