ANSWER
The correct choice is A.
EXPLANATION
The given cosine function is:

This function has an amplitude of 2.
Hence it must have range,
-2≤f(t)≤2
It has a period of 

Hence the function must complete one cycle on the interval, 
[0,½π],
[½π,π],
 etc.
The negative sign shows a reflection in the y-axis but since the cosine function is even, the function retraces itself.
The correct choice is A
 
        
             
        
        
        
Answer:
its b
Step-by-step explanation:
i did this
 
        
                    
             
        
        
        
Answer:
16
Step-by-step explanation:
3/4 = 0.75
12/0.75=16
 
        
             
        
        
        
Answer:
= 486 in²
Step-by-step explanation:
Linear scale factor = Image distance/object distance
Therefore; Linear scale factor = OL'/OL
                                                  = 54/ 12 
                                                  = 9/2 
Area scale factor is equivalent to the square of linear scale factor
Thus;
Area scale factor = (9/2)² 
                              = 81/4
Hence; 81/4 = Area of larger rectangle/Area of smaller rectangle
Area of the smaller rectangle = 4 ×6 = 24 in²
Therefore; 
Area of enlarged or larger pic = 81/4× 24
                                                   <u>= 486 in²</u>
 
        
                    
             
        
        
        
7056. 1008 x 7 = 7056. 7056 / 441 = 16