It would be C because that is the one that make the most sense
your answer would be (2,3)
If r(x)= 11x, and c(x)=6x +20, then just put that into the equation.
So instead of p(x) = r(x) - c(x)
I would be p(x) = 11x - 6x + 20
Now solve.
p(x) = 5x + 20 is your final answer, so A.
45 divided by 50= 90%
0.9*16.50=14.85
Answer:
or 
Step-by-step explanation:
we know that
Applying the law of cosines

In this problem we have

c is the length of the third side
Substitute




or 