Discover Questions

I'm in 11th grade and I'm taking on level pre-calculus. I got a B first semester and C third quarter. Can I take AP AB Calculus and get a B? Verify lagrange's theorum for root x^2 - 1 in [2,4]? Can you prove 9 10 = 21? Whats the origins and purpose of typography? Interference of light supports which theory?