The percent increase from 18 to 26 is about how much percent?

Well if this is 18 out of 100 Then your answer would be 8%

Step-by-step explanation:

18% - 26% = 8%

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

c is the answer

step-by-step explanation: