You are buying carpet to cover a room that measures 21 feet by 30 feet. The carpet costs $15 per square yard. How much will the carpet cost?

20.97

Step-by-step explanation:

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180

go and ask your mom to you