Question

The width of a rectangular garden is 99 feet, and its length is 1212 feet. Three of these expressions equal the perimeter of the garden, in feet. Which expression does NOT?

Answer 1

The expression which is does not correct is A. 9 + 12

Explanation:

Length of the rectangular garden = 12 feet

Width of the rectangular garden = 9 feet

We need to find the perimeter of the garden.

The perimeter of the garden is given by the formula = 2 × (Length + Width)

⇒ Perimeter = 2 × (12 + 9)

= 2 × 12 + 2 × 9

= 12 + 12 + 9 + 9

So, All the options B. , C, and D. are correct to find the perimeter of the rectangular field.

Therefore, The expression which is does not correct is A. 9 + 12

Answer 2

You have not provided the choices, therefore, I cannot provide you with a specific solution. However, I will explain this problem for you to understand an apply on the choices you have.

Now, the perimeter of the rectangle is the summation of lengths of its four sides.
We have:
length = 12 ft
width = 9 ft

Therefore:
perimeter = 12 + 9 + 12 + 9 = 42 ft
Or: perimeter = 2(12+9) = 2*21 = 42 ft
Or: perimeter = 2*12 + 2*9 = 24 + 18 = 42 ft

Any expression that does not lead to the above result would be wrong

Hope this helps :)