0²= 21 ²+2x–9.8 x y
what is y

Jackie purchased 3 bottles of water and 2 cups of coffee for a family for $7.35. brian bought 4 bottles of water and 1 cup of coffee for his family for $7.15. how much does each bottle of water cost? how much does each cup of coffee cost? i need this done

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

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?