What is the value of
x-4 divided by 6 equals 4

Use the elimination method to find the solution to the system of equations. 2x - 3y = -9 -x + 3y = 6

The radius of the base of a cylinder is 10 centimeters, and its height is 20 centimeters. a cone is used to fill the cylinder with water. the radius of the cone's base is 5 centimeters, and its height is 10 centimeters.

Which situation is an example of an observational study?