What are the x-intercepts (zeros) of the quadratic function f(x) = x^2?
+
What are the characteristics of the circle function defined as x^2 + y^2 = r^2, where r represents the radius? Discuss its origin, symmetry, and possible values of x and y.
+
What is the missing side length, x, in a triangle with angle C measuring 40°, side a measuring 5 cm, and side b measuring 8 cm?