X = 60 degrees
Y = 60 degrees
Z = 40 degrees
No. 2.5:3.5 would be either proportional to 12:16.8 or 3.571428( which is 25/7);5
36/7+4
36/11
36÷11=3.27272727.... Repeating
The answer is -8
I found my answer by using desmos. It is the best app for graphing. I wrote the equation and then I looked for the point 18 on the y axis and then I looked where it was on the x axis
that is how I found my answer.