What is the birth rate of 4.5 per min

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

The probability that a student graduating from suburban state university has student loans to pay off after graduation is .60. if two students are randomly selected from this university, what is the probability that neither of them has student loans to pay off after graduation?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if