Time to tests mathmaticians

Find an equation (in term of x) of line through the points (-1,3) and (1,4)

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Determine the common ratio and find the next three terms of the geometric sequence. 10, 2, 0.4, a. 0.2; -0.4, -2, -10 c. 0.02; 0.08, 0.016, 0.0032 b. 0.02; -0.4, -2, -10 d. 0.2; 0.08, 0.016, 0.0032 select the best answer from the choices provided a b c d