PLEASE HELP QUICKLY write a coordinate proof of the following theorem
if a quadrilateral is a kite, then it's diagonals are perpendicular
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The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

Li buys supplies so he can make and sell key chains. he begins to make a profit only after he sells 4 key chains. what point on the graph makes the most sense in this situation?

Need asap. solve for the following inequality