In a quadrilateral ABCD, the measure of angle A is 2x, the measure of angle B is 3x-15(degrees), the measure of C is 4x-90(degrees), and the measure of angle D is x+15(degrees). Find the value of X, Is ABCD a rectangle? What is the average of the four angles?

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what do you know about the sum of internal angles of a quadrilateral?

x=45(degrees) no abcd is not a rectangle
average of angles is=90

not much the whole thing equals 360 degrees

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