Answer:
10 miles.
Step-by-step explanation:
Let x be the number of miles on Henry's longest race.
We have been given that Henry ran five races, each of which was a different positive integer number of miles.
We can set an equation for the average of races as:
![\frac{\text{The sum distances of 5 races}}{5}=4](https://tex.z-dn.net/?f=%5Cfrac%7B%5Ctext%7BThe%20sum%20distances%20of%205%20races%7D%7D%7B5%7D%3D4)
As distance covered in each race is a different positive integer, so let his first four races be 1, 2, 3, 4.
Now let us substitute the distances of 5 races as:
![\frac{1+2+3+4+x}{5}=4](https://tex.z-dn.net/?f=%5Cfrac%7B1%2B2%2B3%2B4%2Bx%7D%7B5%7D%3D4)
![\frac{10+x}{5}=4](https://tex.z-dn.net/?f=%5Cfrac%7B10%2Bx%7D%7B5%7D%3D4)
Let us multiply both sides of our equation by 5.
![\frac{10+x}{5}*5=4*5](https://tex.z-dn.net/?f=%5Cfrac%7B10%2Bx%7D%7B5%7D%2A5%3D4%2A5)
![10+x=20](https://tex.z-dn.net/?f=10%2Bx%3D20)
Let us subtract 10 from both sides of our equation.
![10-10+x=20-10](https://tex.z-dn.net/?f=10-10%2Bx%3D20-10)
![x=10](https://tex.z-dn.net/?f=x%3D10)
Therefore, the maximum possible distance of Henry's longest race is 10 miles.
Answer:
![\$4701.80](https://tex.z-dn.net/?f=%5C%244701.80)
Step-by-step explanation:
Mrs. Siebenaller bought a bus for 25,000 with a 7% interest rate and she gets a loan payoff of 60 months,
We know that,
![\text{PV of annuity}=P\left[\dfrac{1-(1+r)^{-n}}{r}\right]](https://tex.z-dn.net/?f=%5Ctext%7BPV%20of%20annuity%7D%3DP%5Cleft%5B%5Cdfrac%7B1-%281%2Br%29%5E%7B-n%7D%7D%7Br%7D%5Cright%5D)
Where,
PV = Present value of annuity = 25000,
r = rate of interest of each period =
% monthly
n = number of periods = 60 months,
Putting the values,
![\Rightarrow 25000=P\left[\dfrac{1-(1+\frac{0.07}{12})^{-60}}{\frac{0.07}{12}}\right]](https://tex.z-dn.net/?f=%5CRightarrow%2025000%3DP%5Cleft%5B%5Cdfrac%7B1-%281%2B%5Cfrac%7B0.07%7D%7B12%7D%29%5E%7B-60%7D%7D%7B%5Cfrac%7B0.07%7D%7B12%7D%7D%5Cright%5D)
![\Rightarrow P=\dfrac{25000}{\left[\dfrac{1-(1+\frac{0.07}{12})^{-60}}{\frac{0.07}{12}}\right]}](https://tex.z-dn.net/?f=%5CRightarrow%20P%3D%5Cdfrac%7B25000%7D%7B%5Cleft%5B%5Cdfrac%7B1-%281%2B%5Cfrac%7B0.07%7D%7B12%7D%29%5E%7B-60%7D%7D%7B%5Cfrac%7B0.07%7D%7B12%7D%7D%5Cright%5D%7D)
![\Rightarrow P=\$495.03](https://tex.z-dn.net/?f=%5CRightarrow%20P%3D%5C%24495.03)
Hence total amount paid is,
![=495.03\times 60=\$29,701.80](https://tex.z-dn.net/?f=%3D495.03%5Ctimes%2060%3D%5C%2429%2C701.80)
Therefore interest amount is,
![=29,701.80-25,000=\$4701.80](https://tex.z-dn.net/?f=%3D29%2C701.80-25%2C000%3D%5C%244701.80)
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