1 foot = 12 inches so 12 feet = 12*12 = 144 inches from which 14 10" pieces can be cut.
8 square feet.
3 3/4
If the question means "Can the three pieces of wood be placed together to form a triangle", which I suspect it does, the answer is No. In a triangle, any two sides must be longer than the other. 4 + 7 is not longer than 13, so they could not meet is one was joined to a different end of the 13 inch board.
40 board feet
28=A+B+c b=2A c=4A subst. a=4 b=8 c=16
14 pieces. 4 inches left over.
85 inches
1 board foot is a board that is 1 foot long, 1 foot wide and 1 inch thick, so since you did not give length and with of the boards there is no way to answer your question.
lineal is the length board feet is 1ft wide X 1 ft long X 1 inch thick = 1 board foot
8 square feet.
A board that is 7.5 feet long is 7.5 x 12 = 90 inches long. You can (mathematically) make 10 blocks 9 inches long from 90 inches of material, but only if the blade of your saw has a width (kerf) of zero. In the real world, you'll get 8 blocks and a good bit of change sawing 9 inch blocks off a 7.5 foot board. For a saw kerf of 0.125 inches (1/8th of an inch), You'll have lost 1 inch in your cuts, and you'll get 8 of the 9-inch pieces with your leftover piece being 8 inches long.
3 3/4
4
3 feet. Because 1 foot = 12 inches and if you divide 36 by 12 you get 3
Circumference of a 25 feet circle = pie x diameter x 12 942.477 inch 1 feet = 12 inch so i converted into inch as i am having the other component in inch No of 12 inch long blocks = circumference /12 so total 78 pieces will be required to make a circle of dia 25 feet
3 feet. Because 1 foot = 12 inches and if you divide 36 by 12 you get 3
3 feet. Because 1 foot = 12 inches and if you divide 36 by 12 you get 3