Answer: option D
Step-by-step explanation:
 Remember the cosine identity:
 
 Given the right triangle DFE shown in the image, you can identify that the adjacent side and the hypotenuse for the angle F of this triangle are:
 
 Now you can substitute values into   and then reduce the fraction.
 and then reduce the fraction.
 THerefore you get:
 
        
                    
             
        
        
        
Answer:
x = 5
Step-by-step explanation:
a || b and a line intersecting them is their transversal. 

 
        
             
        
        
        
 Answer:
x = 
Step-by-step explanation:
Given
A =  xy
 xy
Multiply both sides by 2 to clear the fraction
2A = xy ( divide both sides by y )
 = x
 = x
 
        
             
        
        
        
Let
x---------> amount of money saved by Mark
x---------> amount of money saved by Neil
we know that
x=y+258-------> equation 1
x/y=(7/4)-------> equation 2
substitute equation 1 in equation 2
(y+258) /y=7/4--------> 4*(y+258)=7*y------> 4y+1032=7y
7y-4y=1032--------> 3y=1032------> y=$344
x=344+258------>x=$602
the answer is
$602
 
        
             
        
        
        
Quite a broad question. 10/2 you divide by 2 which equals 5. Is that your question?