What is 758380 x -289829

Ineed if you could explain and give me the answer you! this needs done

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

You just purchased two coins at a price of $670 each. because one of the coins is more collectible, you believe that its value will increase at a rate of 7.1 percent per year, while you believe the second coin will only increase at 6.5 percent per year. if you are correct, how much more will the first coin be worth in 15 years?