y increases as x increases 
 
        
                    
             
        
        
        
X + y = 20 Substitute
x by 2 y - 4 in x + y = 20 to obtain 2 y •
4 + y = 20 Solve for y to find y = 8 and
x = 2y - 4 = 12
        
                    
             
        
        
        
Answer:
B
Step-by-step explanation:
f(x)= -3(x+1)^2 +2
>  -3,   Has to negative because its facing down
>(x+1) means it goes to the left 1 unit
> +2 at the end means it goes up by 2 units
 
        
                    
             
        
        
        
The distance between point on the ground from the top of the building is 396 meter, if the building is 280 m high and The angle of depression from the top of a building to a point  on the ground is 45 degrees.
Step-by-step explanation:
The given is,
                  The angle of depression from the top of a building to a point  on the ground is 45 degrees. 
                  Height of the building is 280 meter.
Step: 1
                  Given diagram is a right angled diagram,
                  For right angle triangle,
                               90° = 45° + 45°     
                                      = 90°  
                  Trignometric ratio,
                             sin ∅ =  ....................(1)
....................(1)
                 For the above ratio take the bottom angle, that is angle of depression from the top of a building to a point  on the ground is 45 degrees.
                  Where, Opp side = 280 meters
                                Hyp side = x
                                            ∅ = 45° 
                  Equation (1) becomes,
                                   sin 45° = 
                           0.70710678 =  
                                             x =  
                                             x = 395.979
                 Distance between point on the ground from the top of the building,  x ≅ 396 meter                                                  
                 Trignometric ratio,
                                      cos ∅ =  
 
                                    Cos 45 =  
 
                                          Adj = (0.70710678)(396)
               Bottom length, Adj = 280 meter
Result:
            The distance between point on the ground from the top of the building is 396 meter.
 
        
             
        
        
        
The correct answer is the third one (x,y) - (-x, -y)