When a firm is producing at the level of output that maximizes profit, which of the following is true? A. Marginal cost is negative.
B. Marginal revenue is equal to marginal cost.
C. Marginal revenue is positive.
D. arginal revenue is greater than marginal cost.

The greatest gift the sumerians gave the world was the invention of writing. the sumerians were a wealthy people. they needed some way to keep track of what they owned. they began drawing pictures. they used a reed as a pen. they drew on soft pieces of clay. the soft clay was then dried in the sun. the tablet became a permanent record. later, the sumerian drawings changed into wedge-shaped symbols. this kind of writing is called cuneiform. by putting symbols together, the sumerians could write entire sentences.

Which two pronouns in the paragraph have unclear antecedents? cleaning the closet yesterday i cleaned my closet and dusted it thoroughly. i found receipts in a few of my jeans. i folded them neatly and put them in my drawer. i found an old box decorated with ribbons and a pink bow. it still looked pretty and new. in the bottom drawer, there was a bottle of perfume that mom bought in sweden. the perfume is old, but it still has a fresh, flowery scent. next to the perfume there was an old postcard that dad sent when he visited china.

Reat britain justified raising taxes on colonists because of which event? british merchants being denied entry into colony ports colonists picking up arms against british soldiers and merchants american indians receiving more trading from colonists british debt from defending the colonies in the french and indian war