Find the volume of a rectangular block of ice 2ft by 3 1/2ft 1//2ft.

To find the volume of a rectangular block, you need to multiply its length, width, and height.

Given:
Length = 2 ft
Width = 3 1/2 ft or 7/2 ft
Height = 1/2 ft

Volume = Length * Width * Height
= 2 ft * (7/2) ft * 1/2 ft
= 2 ft * 7 ft * 1/2 ft
= 7 ft * 1 ft
= 7 ft²

Therefore, the volume of the rectangular block of ice is 7 cubic feet.