Two plumbing companies charge a flat free for a service call, plus an hourly rate for a plumbing repair. Marco’s plumbing charges $165 for a 2-hour plumbing repair or $255 for a 4-hour plumbing repair. Jack’s plumbing uses the equation C=100+40h to calculate the cost, C, for h hours of repairs. Which company charges more for 3-hour plumbing repair and how much more?

Five more than the product of a number n and 8 is at least 100. write an inequality that can be used to find all positive values of n

Amuffin recipe, which yields 12 muffins, calls for cup of milk for every 1 cups of flour. the same recipe calls for cup of coconut for every cup of chopped apple. to yield a batch of 30 muffins, how much flour will be needed in the mix?

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