The length of the rectangle is a mi, and the width is 3 cm less than the length.

The length of the rectangle is a mi, and the width is 3 cm less than the length. find the perimeter of the rectangle at a = 8.

Let’s write an expression for calculating the width of the rectangle – subtract 3 cm from the length of the rectangle:

a – 3 cm width of the rectangle.

Now let’s write the expression for calculating the perimeter – add the length and width and multiply by two:

(a + a – 3) * 2.

Let’s simplify this expression and open the brackets:

(2a – 3) * 2 = 4a – 6.

Now we substitute the numerical value 8 for the variable a and calculate the perimeter:

4 * 8 – 6 = 32 – 6 = 26 cm perimeter of the rectangle.

Answer: the perimeter of the rectangle is 26 cm.