Choose all the equations which are correctly solved. x^2– 5x + 5 = 0 {2,3}

x^2 – 7x - 8 = 0 {-1, 8}

x^2 + 12x + 20 = 0 {-2, -10}

x^2 – 3x – 10 = 0 {2, 10}

x^2 + x + 20 = 0 {4,5}

Find the multiplicative inverse of 8-12i

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

Se tiene en una caja de canicas 10, 4 blancas y 6 negras ¿cual es la probabilidad que en 2 extracciones con reemplazo sean blancas? ¿cual es la probalidad que en 2 extracciones sin reemplazo sean negras?