I think it would have to be Zippy the Knave and Ted be the Night.
For this case we have that by definition, the equation of a line of the point-slope form is given by:

Where:
m: It's the slope
: It is a point through which the line passes
To find the slope, we need two points through which the line passes, observing the image we have:

Thus, the equation is of the form:

We choose a point:

Finally, the equation is:

Answer:

Option D
The solution to your Q is got to be 9t=6.3
Profit = Revenue - Cost = R(x) - C(x) = (x^2 + 20x + 50) - (50x + 30) = x^2 - 30x + 20
I think is the top one!!!!!!!