What is the slope of a line that contains the points (2,-7) and (-1, -6)

What is the rescursive formula for this geometric sequence? 7, -14, 28, -56

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

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.