20. Using absolute value, make (-10) turn into 10 and do 10 + 10 = 20
4 is on the y-intercept. the y axis is vertical and the x axis is horizontal.
The remainder is 49.
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Area of entire figure = (16+12)(5)(0.5)(2)=140
Area of rectangular glass= 10*12=120
Area of wooden top= 140-120=20ft^2
