the tempature at 6 am is -14F. The tempature increases an average 3/4F each hour until noon, and then it does an average of 1 1/4F each hour until 5 pm.

Lucy is a dress maker. she sews \dfrac47 7 4 ? of a dress in \dfrac34 4 3 ? hour. lucy sews at a constant rate. at this rate, how many dresses does lucy sew in one hour? include fractions of dresses if applicable.