Alumberman stacks planks of wood, starting with 30 planks in a row. each row he stacks has one less plank than the row below it. the last row he stacks has 15 planks. how many rows of planks has he stacked?
12
15
16
18

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

You wanted to draw an enlargement of design that printed on a card that is 4 in by 5

This is about circle theorems. someone asap : (