The neighbor will donate $0.25 for every 40ft run.
The aunt will donate $18 for every mile run.
To determine how much he will raise if he runs 5miles, you have to calculate the amount per donor and then add them:
Neighbor
1 mile is equal to 5280 feet
To determine how many feet correspond to 5 miles, multiply the distance by 5280
Next, calculate how much we will make:
40ft → $0.25
26400ft → $x
For running 5miles, Dustin will raise $165 from the neighbor.
Aunt
The aunt will donate $18 per mile run, to determine how much she will donate, multiply $18 by 5
For running 5 miles, Dustin will raise $90 from the neighbor.
Next, add both amounts:
Dustin will raise $255 for running 5 miles.