The heights of mature maple trees are approximately normally distributed with a mean of 80 feet and a standard deviation of 12.5 feet. What proportion of mature maple trees are between 60 and 90 feet? (round to the nearest whole percent)

Part a: sam rented a boat at $225 for 2 days. if he rents the same boat for 5 days, he has to pay a total rent of $480. write an equation in the standard form to represent the total rent (y) that sam has to pay for renting the boat for x days. (4 points)