Final answer:
To find the shaded area of a rectangle that is 3 units by 2.5 units, simply multiply the lengths of the sides. The area is 7.5 square units. However, this answer does not match the provided choices, indicating a possible error in the question or answer options.
Step-by-step explanation:
The problem involves solving for the area of a rectangle where the sides are given in 'units'. Since each unit is cut in half, shading an area that is 3 units by 2 1/2 units means we are calculating the area of this portion of the grid. The area can be found by multiplying the length and width of the rectangle.
To solve, first adjust the units to be consistent and multiply the length by the width:
- Length: 3 units
- Width: 2.5 units (since 1/2 unit is added to 2 units)
Area = Length × Width = 3 units × 2.5 units = 7.5 square units.
However, this number does not appear in the options provided. There could be a mistake in the question or in the answer choices. If the shaded area is indeed 3 units by 2 1/2 units, the correct calculation of the area would be 7.5 square units.