96 POINTS!!!! PLEASE HELP!
2 answers:
A. I suppose the horizontal axis represents the amount of miles Anna drives. You're asked to use the graph to find an equation for the line. You know two points it passes through; this is enough to determine the slope of the line:
Now use the point-slope formula to get the line's equation. Using the leftmost point, for instance, we have
This is to say, the amount of fuel (in gal) that Anna uses is given exactly by dividing the distance traveled
(in mi) by 48.
B. Driving 12,000 mi requires 250 gal of fuel (according to both the rightmost point on the graph as well as the value of in the previous equation for
). She pays $2.40 per gal, so the total cost for 250 gal is
($2.40/gal) * (250 gal) = $600
C. Evan's car uses approximately
(12,000 mi) / (30 mi/gal) = 400 gal
per year, which costs him an annual total of about
(400 gal) * ($2.40/gal) = $960
We need to know the price of Anna's car to answer the actual question, though...
You might be interested in
Answer:
And solving for the radius we got:
And replacing the data given we got:
And this value converted to meters is
Step-by-step explanation:
For this case we know the population size and we also know the population density
We can assume that the area is a circle. We also know that the formula for the population density is given by:
Where P represent the number of people and A the area. Since we are assuming a circle then the area is given by:
With X the radius of the circle
And then the populationd density become:
And solving for the radius we got:
And replacing the data given we got:
And this value converted to meters is