Sea turtles are among the most ancient creatures on earth. there are seven species of them today and they all have existed for 110 million years (since dinosaurs roamed on the planet! ) sea turtles eat a wide range of animals and plants. john also loves sea turtles. he plans to cover a wall with 4 posters of sea turtles all in a row. his wall is 18 feet high and 24 feet wide. if the height of a poster is not greater than two times the width, what is the maximum height of a poster?