If the present value of $400 paid one year from now is $320, what is the one-year interest rate? (Note: this number is also known as the discount rate.)

Is the power produced directly proportional to the wind speed, give reasons for your answer?

There are three bags: a (contains 2 white and 4 red balls), b (8 white, 4 red) and c (1 white 3 red). you select one ball at random from each bag, observe that exactly two are white, but forget which ball came from which bag. what is the probability that you selected a white ball from bag a?

Let f(x) = 5/x and g(x)=2x2+5x. what two numbers are not in the domain of f o g