This is a proportion so
6/15=2/c
make the left side top number equal to the right side top number and you will find c
6/15=2/c
6/3=2
6/15 times (1/3)/(1/3)=2/5
2/5=2/c
c=5
the other way is multiply both sides by c/2
6c/30=1
multiply both sides by 30
6c=30
divide both sides by 6
c=5
The answer for your problem is B.
The third choice does not represent a proportional relationship because the y-intercept ≠ 0.
Hope that helped you.
LOL, I should copy and past :)
The sum of angles for any triangle is always 180°, so in this case we can say:
x+3x+x+15=180 combine like terms on left side
5x+15=180 subtract 15 from both sides
5x=165 divide both sides by 5
x=33°
That of course is just x, the angles show specifically can be found by using that value of x for the others...
x, 3x, x+15 are 33°, 99°, 48° respectively
16.6 is a rational number