What is the common point between lines y = ½ x + 4 and y = x – 4?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

Astudent was asked to find the square of 7x+3. the student quickly wrote (7x+3)^3= 49x^2+9. identify the student's error and provide the correct answer.

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?