Calculează 4 xa-b:3 +5 XC + d: 6, a = (9 000 - 75:5-8905): 4
b = 76 x 8 x (2 987 – 2986) - 575​

Can any one me with the answers to these questions asap?

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

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25