Donnell practiced 7 hours while Marcus practiced 4 hours.
        
             
        
        
        
Answer:
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Step-by-step explanation:
 
        
                    
             
        
        
        
Area of part 1:A1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2Area of part 2:A2=length*width=(8+2)*1=10 ft2Area of part 3:A3=length*width=8*2=16 ft2
Total shaded area : A1+A2+A3=41 ft2Total area of the reactangle : A=16*8=128 ft2Total area of the nonshaded region : 128-41=87 ft2
        
             
        
        
        
Answer:
y = (7 - x) / 2
Step-by-step explanation:
You isolate the y by subtracting the x 
2y = 7 - x
and then you divide by two to get the answer to y
 (7 - x) / 2
 
        
             
        
        
        
Wow...we have lots of numbers to go through.  we know that a 6 sided figure is a hexagon and the interior angles add up to be 720°. so.....
∠A + ∠B + ∠ C + ∠D + ∠E + ∠F = 720°
(x - 60) + (x - 40) + 130 + 120 + 110 + (x - 20) = 720
3x + 240 = 720      (combined all like terms)
3x = 480                (subtracted 240 from both sides)
x = 160                  (divided both sides by 3)
put the value of x into ∠A  (x - 60) = 160 - 60 = 100
∠A = 100°