Area of the square base = 5^2 = 25 cm^2 Area of one of the triangular side = 1/2 * 5 * 8 = 20 cm^2 and there are 4 sides So the surface area of while pyramid = 4 * 20 + 25 = 105 cm^2
Volume of the cone = (1/3) pi r^2 h = (1/3) pi * 5^2 * 8 = 209.44 ft^2
If 1/10 of the tank is filled in 1/5 of an hour, then multiplying both of those by 5 you would get 5/10 of a tank being filled in a full hour, or answer choice A. Hope this helps! By the way, sorry for the incorrect answer a couple years ago :)