If the vertices of triangle are (1, -3), (4, p) and (-9, 7) and its area if 15 square units, find the value of p

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.