Please help me Will give brainiest

How many sides does a regular polygon have if each exterior angle measures 72a.3b.4c.5d.6

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

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?