The atlantic ocean region contains approximately 2 x 10^16 gallons of water.
lake ontario has approximately 8,000,000,000,000 gallons of water. how many lake ontarios would it take to fill the atlantic ocean region in terms of gallons of water?

The number if marbles of different colors stored in a hat is listed below: 4 red marbles 10 green marbles 7 blue marbles. without looking in the hat, dan takes out a marble at random. he replaces the marble and then takes out another marble from the hat. what is the probability that dan takes out a blue marble in both draws?

Solve the system of equations y= 3/2 - 1, -x+ y =-3

If value of cos330° is √3/2 then find tan165°.