See my previous answer to this same question. the vertical angles have to be right angles
        
                    
             
        
        
        
Answer:
My age is 78 years.
Explanation:
Define my age first as a variable.
Let my age be  
x
 years.
Reduced by means subtracted.
Subtract twice my age from 400 to get 244:
400
−
2
x
=
244
400
−
244
=
2
x
      
←
 make x positive and isolate it.
156
=
2
x
78
=
x
Step-by-step explanation:
 
        
                    
             
        
        
        
<span>Formula: H(t) = 56t – 16t^2  
</span>
H(t) = - 16t^2 + 56t
<span><span>A.     
</span>What is the height of the ball after 1 second? H
(1) = 56(1) – 16(1) ^2 = 40 pt.</span>
<span><span>B.     
</span>What is the maximum height? X = - (56)/2(- 16) =
1.75 sec h (1.75) = 56(1.75) – 16(1.75) ^2 h (1.75) = 49ft.</span>
<span><span>C.     
</span><span>After how many seconds will it return to the
ground? – 16t^2 + 56t = 0   - 8t =0 t = 0</span></span>
<span><span>-         
</span><span>8t (2 + - 7) = 0     2t – 7 = 0  t = 7/2  
Ans: 3.5 seconds</span></span>
 
        
             
        
        
        
42 + 6 divided by 2 equals 24