The sum of a number and nine is multiplied by-2 and the answer is -8. Find the number​

Step-by-step explanation:

Step-by-step explanation:

let number be x

-2(x+9)= -8

-2x -9= -8

-2x = -8+9

-2x= 1

x= -1/2

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

step-by-step explanation:

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