Volume of sphere with a radius of 1/4

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

The height of a flare fired from the deck of a ship in distress can be modeled by h(t)= -2(8t^2-52t-28), where h is the height of the flare above water and t is the time in seconds. a. find the time it takes the flare to hit the water.

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab