qwenie

The cost and revenue functions for a certain production facility are: C(x) = {x^2} + 2\,\,{\rm{and}}\,\,R(x) = 2{x^2} - x, then the break-even points are ( - 1,3)\,\,\,{\rm{and}}\,\,\,(2, - 6).

Let f be the function defined by f(x) = 2{x^3} - 4x + 1. Which of the following is an equation of the line tangent to the graph of f at the point x = - 1?

A bicycle trip starts at 2:00 p.m. and ends at 5:45 p.m. If the cyclist travelled 86.3 miles, what was his/her average velocity?

Through a mix-up on the production line, 21 defective ovens were shipped out with 29 good ones. If 8 are selected at random, what is the probability that none of them are defective? need help ASAP

There are 20 people in a club. In how many ways can the club elect a president, a secretary and a treasurer, on person can hold more than one office?

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thank you