Solve the literal equation 5a + 10b = 2b - 4a for a.

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

If sr is 4.5cm and tr is 3cm, what is the measure in degrees of angle s?

Answer for 10 points show work you guys in advanced < 3