The answer is D
Because I worked it out
Answer:
Step-by-step explanation:

C real numbers is the answer
A+B=$101 billion
A=B+$47 billion
2B+$47 billion=$101 billion.
2B=$54 billion
B=$27 billion
A=B+$47 billion
A=$74 billion.
Answer:
Look just at finding the linear model. Two points. Use price per gallon for x and gallons per hour sold for y. Your two points (x,y) are (2.15,1600) and (2.55,800).
Slope m=%281600-800%29%2F%280.15-0.55%29
m=800%2F0.40
m=2000
Using point-slope form for a line, and the lower-y point,
y-800=2000%28x-2.55%29
highlight%28y=2000%28x-2.55%29%2B800%29