WE - Select the CONTROLS tab. I Unselect all checkboxes. Activity A: Explicit formula 1. Before using the Gizmo, consider a geometric sequence with a first term (31) of 0.5 and a common ratio (r) of 2. (Hint: Since r = 2. each term will be twice the previous term.) A. What are the first four terms of the sequence? B. In the Gizmo. set a1 = 0.5 and r: 2. The graph in the Gizmo represents the sequence. Click and drag the graph downward to see more points. What are the rst four points on this graph? (Place your cursor over any point to see its coordinates.) First four points on the graph: Select the TABLE tab. Each row of this table gives the coordinates of a point on the graph. Check your answers. and then return to the CONTROLS tab. C. The points in the graph of a sequence are called (n, an) instead of (x. 3!). For each point. what does n mean? What does a. mean? D. What do you think are the coordinates of the 8'\" point? Check your answer in the Gizmo, using either the graph or the table