During the early 20th century which factor contributed to american imperialism?

The divide and rule policy employed by the english was developed by the

Profits are maximized when marginal revenue and marginal costs are a. set c. equal b. less than market price d. greater than market price

Plz ive been stuck on this question forever. in 1753 george washington was sent on a mission to a. build a fort at the point where the allegheny and monongahela rivers form the ohio river. b. attack the french at fort duquesne. c. attack the french at fort neccessity. d. deliver a message to the french demanding that they leave the ohio river.