I think it is d I am not sure but i guess it's D
Answer:
The maximum revenue will be
at price 
Step-by-step explanation:
Given:

Find the vertex of the parabola represented by given equation:

When
then

The maximum revenue will be
at price 
Let Paul's house be at the origin of a coordinate grid. then Mary lives at (-6,-9) and Benjamin lives at (7,3). using the distance formula for these two points gives us d=√(-6-7)² + (-9-3)².
d=√169+144 or√313 miles, or about 17.69 miles.
Answer:
x=8/3
y= -20/9
Step-by-step explanation:
4X + 3Y -4 =0
Linear egquations must in

so 4X + 3Y =4
THEN
3X + 9Y = - 12
next use calculator to solve it or you can use traditional way