Susan is flying a kite, which gets caught in the top of a tree. Use the diagram to estimate the height of the tree.
63 ft
65 ft
741
87

In a quadratic function of the form ax^2+bx+c, which of the following is not true? a. the y-intercept is c. b. if a is positive, the parabola opens up. c. the vertex has an x-coordinate of -b/2a. d. the axis of symmetry is the line y=-b/2a.