Carpet costs $15 per square yard. if a room is 12 feet by 21 feet, how much will it cost to carpet the room? a) $3780b) $420! : 3

$420

Step-by-step explanation:

First convert the room measurements from feet to yards to match the unit of measure of the carpet.

Room size is 12 feet by 21 feet.

3 feet = 1 yard.

12/3 = 4 yards

21/3 = 7 yards

4 yards times 7 yards = 28 square yards

28 square yards times $15 per square yards = $420.

step-by-step explanation:

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.