Term to be added is: + 121/4
t^2 + 11t + 121/4
(t + 11/2) (t + 11/2) 
        
             
        
        
        
Answer:
75
225÷3=75
Step-by-step explanation:
hshshshshs
 
        
             
        
        
        
Answer:
72
Step-by-step explanation:
The pythagorean theorem states that in a right triangle A^2 + B^2 = C^2 where A and B are the two smaller sides and C is the hypotenuse. 
Because of this, in this triangle 30^2 + B^2 = 78^2
Which means B^2 = 5184
And B = 72
 
        
             
        
        
        
he would have traveled 210 miles because in half an hour he would have traveled 30 miles and in 3 hours he would have traveled 180 miles. so we have to add those up and we get our answer: 210 miles