Simplify (27^1/3)²

A student told to draw the graph of y = x² + 4x - 6. He is then told to draw a liner graph on the same axis such that the intersection of the two graphs will give the solutions to the equation x² + 4x - 7 = 0, What is the equation of the linear graph he needs to draw?

Find the quadratic equation whose roots are x = -2 or x = 7

A sales girl gave a change of N1.15 to a customer instead of N1.25. Calculate her percentage error