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?