A16oz bottle of spring water is $2.08 a 20 oz bottle of freshwater is $2.40

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items