The table shows the cost y (in dollars) of renting x movies

Someone please awnser this

-18

step-by-step explanation:

because mean value defines that total sum value over total number of set

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