You decide to participate in a charity walkathon to raise money for your cause. Some people decide to donate a fixed amount, while others agree to donate a little money for
every mile you walk. Before the event starts, you raised $25, and you have been pledged
$1.50 for each mile you walk. The function is defined by d(m) = 1.5m + 25 can be used
to relate the miles you walk, m, and the amount of money donated to you in dollars,
d(m).
Explain your answer in the context of the problem