Deloris wants to cover a parallelogram-shaped area of her backyard with yellow, concrete patio stones. each stone costs $6.42 and covers 50 square inches. the parallelogram-shaped area in the backyard has a height of nine feet and a base of 12 feet.

$1983.78

Step-by-step explanation:

It is given that the height of parallelogram shaped area is 9 feet and the length of the base is 12 feet.

We know that the area of parallelogram is,

, where 'A' is the area, 'a' is the and 'b' is the base of the parallelogram.

Putting the values we get,

Now, it is given that each stone covers an area of 50 square inches, let us convert square inches into square ft, first.

1 square inch = 0.007 square ft

50 square inches = square ft

So each stone covers 0.35 square ft, therefore to cover the area of 108 square ft, we need,

stones

Each stone costs $6.42, so the cost of 309 stones will be,

So the total cost of covering the parallelogram shaped area with yellow, concrete patio is $1983.78.

the 3rd option is right

step-by-step explanation: