Find the slope of the tangent line to the parabola y=4x-x^2 at the point (1,3)

Jackie purchased 3 bottles of water and 2 cups of coffee for the family for $7.35. ryan 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?

The price of an item has been reduced by 30%. the original price was $30. what is the price of the item now ?

Find the area of the triangle shown 3 by 6