Polygon abcd has the following vertices: a(-4,2) , b(3,2) , c(3,-5) , and d (-4, -2) calculate the area of the polygon

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30