How do I solve function operations?

What are the solutions of the system? solve by graphing. y = -x^2 - 3x + 2 y = -2x + 2

Which best describes the construction of a triangle if given the segment lengths of 2 cm, 3 cm, and 5 cm? a) unique triangle b) cannot be determined c) triangle not possible d) more than one triangle

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)