A school requires 2 computers for every 5 students. If a school has 145 students, how many computers do they need?

The general form of the quetion of a circle is ax^2+by^2+cx+dy+e=0 where a=b=0 if the circle has a radius of three units and the center lies on the y axis which set of values of a, b, c, d, and e might correspond to the circle

How do you solving the solution of each system using elimination?

Find the domain of the following expression: 1/(√x)-2