Andres school orders some new supplies for the chemistry lab. the online store shows a pack of 10 test tubes costs $4 less than a set of nested beakers. in order to fully equip the lab, the school orders 12 sets of beakers and 8 packs of rest tubes. a. write an equation that shows the cost of a pack of test tubes, t, in terms of the cost of a set of beakers. b. the school office receives a bill for the supplies in the amount of $348. write an equation with t and b that describes this situation. d. solve equation for b. e. how much did the school pay for a set of beakers? for a pack of test tubes?

An oil exploration company currently has two active projects, one in asia and the other in europe. let a be the event that the asian project is successful and b be the event that the european project is successful. suppose that a and b are independent events with p(a) = 0.2 and p(b) = 0.8. (a) if the asian project is not successful, what is the probability that the european project is also not successful? (b) what is the probability that at least one of the two projects will be successful? (c) given that at least one of the two projects is successful, what is the probability that only the asian project is successful? (round your answer to three decimal places.)