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

To find the perimeter of a rectangle, the formula used is ( P = 2 \times (length + width) ). In this scenario, the rectangle has a length of 10 units and a width of 5 units.

First, you add the length and the width together:

( 10 + 5 = 15 ).

Next, you multiply that sum by 2 to calculate the perimeter:

( 2 \times 15 = 30 ).

Therefore, the perimeter of the rectangle is 30 units. This makes the answer correct, as it matches the calculation based on the dimensions provided.