Triangle RST, with vertices R(-5,5), S(-3,8), and T(-7,7), is drawn inside a rectangle, as shown below. What is the area, in square units, of triangle RST?

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# Triangle RST, with vertices R(-5,5), S(-3,8), and T(-7,7), is drawn inside a rectangle, as shown below. What is the area,

Triangle RST, with vertices R(-5,5), S(-3,8), and T(-7,7), is drawn inside a rectangle, as shown below. What is the area, in square units, of triangle RST?