Some students at Derin's school signed a petition asking for a reading area for recess. The graph below shows the number of signatures from each grade. A signature picture.
A signature picture.
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A picture graph shows the horizontal axis labeled Number of signatures and the vertical axis labeled School grade. Each school grade is listed along the vertical axis from the bottom of the axis to the top of the axis as follows: fourth, third, second, and first. The number of signatures for each school grade is represented by the number of signature pictures plotted on the graph. Fourth grade is represented by 7 signature pictures, third grade is represented by 8 signature pictures, second grade is represented by 2 signature pictures, and first grade is represented by 3 signature pictures.

A picture graph shows the horizontal axis labeled Number of signatures and the vertical axis labeled School grade. Each school grade is listed along the vertical axis from the bottom of the axis to the top of the axis as follows: fourth, third, second, and first. The number of signatures for each school grade is represented by the number of signature pictures plotted on the graph. Fourth grade is represented by 7 signature pictures, third grade is represented by 8 signature pictures, second grade is represented by 2 signature pictures, and first grade is represented by 3 signature pictures.
How many total signatures are on the petition?
signatures