47 yards cuz u add 20+12+5+10=47
5 because 4x + 8x is 12x and then you add 13 to 47. Lastly, divide 60 by 12x which gives you 5 :)
9) 2( 2d - 3) + 2 (3c)
= 4d. - 6. + 6c
Lets find the area of the 2 rectangles on the left and right side.
8*7 (2) = 112 (Both rectangles in total)
Now lets find the rectangles on the front and back.
13*7 (2) = 182
Now, the top and bottom ones.
13*8 (2) = 208
Add them all together.
112+182+208 = 502
The surface area is 502.