Does anyone know how to do problems like these? This is not a test, but we are preapring for one, so I really need help. Thank you.​

Find the nonpermissible replacement for binthis expression. b2/5b +5

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

Find the difference in area between the circle and the triangle. click on the answer until the correct answer is showing. possible answers: a = 4 pi - 8a = 9 pi - 9/2 √3a = 16/3 pia = 16a = 27 pi