Answer:
87.75
Step-by-step explanation:
You are correct 
 
        
             
        
        
        
I found an image that corresponds to the above question.
The shape was a rectangle. Its width is 7 units, its length is x.
The shaded area of the rectangle forms a trapezoid.
Area of a trapezoid = [(a+b)/2] * h
63 sq. units = (7+x)/2 * 7
63/7 = (7+x)/2
9 = (7+x)/2
9*2 = 7 + x
18 = 7 + x
18 - 7 = x
11 = x
The value of x is 11 units. It is the length of the rectangle.
Area of the trapezoid = (a+b)/2 * h
63 = (7+11)/2 * 7
63 = 18/2 * 7
63 = 9 * 7
63 = 63 
 
        
        
        
Answer:
they are not equal if that was what you were looking for
Step -by-step explanation:
 
        
                    
             
        
        
        

Taking the square root of both sides gives two possible cases,

or

Recall that

If  and
 and  , we have
, we have

so in the equations above, we can write

Then in the first case,


(where  is any integer)
 is any integer)


and in the second,




Then the solutions that fall in the interval  are
 are
