I need help please it’s evaluating expressions

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

What are the relative frequencies to the nearest hundredth of the columns of the two-way table?

The lengths of nails produced in a factory are normally distributed with a mean of 4.91 centimeters and a standard deviation of 0.05 centimeters. find the two lengths that separate the top 4% and the bottom 4%. these lengths could serve as limits used to identify which nails should be rejected. round your answer to the nearest hundredth, if necessary.