D. It is a convex pentagon because it has five sides and none of the sides would extend into the inside of the polygon.
A triangle has three sides. A ratio is a comparison of two things. We pick two different sides of the triangle to compare (because there is not much point in comparing one thing to itself). How many ways are there to do this? The first choice has 3 options, and the second has 2, so we have a total of
possibilities.
Equation: y=15x+30
That would be your equation because the kennel charges a flat fee of $30 for the bath at the end and since it charges $15 per day that would be your dominate number in the equation.
So you subtract 4y-y
theb u subtract 11 from both sides
divide 3 to 27
and u get 9
3y=27
y=9