How many quarts of water must be added to 4 quarts of an 80% mixture to obtain a 50% mixture?

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?

Drag the tiles to the boxes to form correct pairs. not all tiles will be used. match each set of vertices with the type of quadrilateral they form

Evaluate cos2θ for cosθ = square root of 3/2