Derive a formula for calculating the cost, $ C, of working h hours. Use your formula to calculate the cost of a job taking 3 hours 15 minutes.

How was rockefeller able to build his monopoly across the oil industry? he found newer and cheaper ways to refine oil, increasing his profits. he confined his business to ohio so he could buy all the refineries there. he bought up oil refineries, cut costs, and reinvested his profits in other refineries. he began to sell kerosene as well as oil, expanding his market.

Who led the continental army in the final decisive battle of the revolutionary war at yorktown

Who did the first work in creating vaccines