The cost per mile driven represents the slope of the function. So b. 15 cents per mile driven is the slope-the price increases as the number of miles increase.
If any digit can be 0 to 9 with no restrictions, the number of possible zip codes is ...
10×10×10×10×10×10 = 10⁶ = 1,000,000.
b) c = b3.99 + 4.95
c is the total cost, 4.95 is a constant fee that you have to pay for the monthly service, so that will always be there. b3.99 will vary depending on how many books are downloaded.
c) I can't really graph now I'm sorry, I don't know if this graph should be accurate or not but If you want it very accurate then you're gonna have a y-intercept (x = 0) at 4.95 And you're gonna wanna go up 3.99 units each x unit, so at (x=1) you must be at y= 4.95 + 3.99 = 8.94
If you don't want it extremely accurate then you can just make the y-intercept at 5 and you can go up 4 units each x unit.
(1/12)X = 6800
6800/ (1/12) = X
X = 81600 (hours)
6800 (6.8 * 10^3) divided by 1/12 (12^-1) equals 81600. It will take 81600 hours for the pool to completely empty at a rate of 0.833333333 or 12^-1 gallons per second.
