Find the Surface Area of the following:

You give a $4 tip for a meal that cost $22. approximately what percent of the bill was your tip?

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?

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!