Im sorry for so many questions but i need badly.
the circumference of a circle with the diameter of 5 cm is 15.7 cm. what is the ratio of thecircumference to the diameter?

the circumference of a circle with the diameter of 5 cm is 15.7 cm. what is the ratio of thecircumference to the diameter?

the circumference of a circle is 16π inches. show how you can use this information to calculate the same circle’s area.

again im sorry for so many question. but me with this.

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297