What is the perimeter of a rectangle with length 10 and width 5?

To calculate the perimeter of a rectangle, you use the formula:

Perimeter = 2 × (Length + Width).

In this case, the length of the rectangle is 10 and the width is 5. Plugging these values into the formula gives:

Perimeter = 2 × (10 + 5) = 2 × 15 = 30.

Thus, the correct answer for the perimeter of the rectangle is 30. This means that if you were to measure all the way around the rectangle, the total distance would be 30 units. This understanding of the perimeter calculation is essential in various mathematical applications, particularly in geometry.

So, the choice of 30 appropriately represents the perimeter given the dimensions provided.