If X= 7 units, Y = 4 units, and Z = 13 units, what is the approximate volume of the triangular pyramid shown above? OA.
46.67 cubic units
OB. 45.5 cubic units
OC. 60.67 cubic units
OD
121.33 cubic units

Asocial networking site currently has 400,000 active members, and that figure is predicted to increase by 32% each year. the following expression represents the number of active members on the site after t years.

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

I’m stuck on this equation, anyone got the answer?