A path is made of white tiles and grey tiles. 1/4 of the tiles are white.

There is a total of 56 tiles.

Work out the number of grey tiles.

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

In which form is the following function written? y = - 2(x – 3)(x + 5)

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