suppose a perfectly competitive firm with total cost function given as :TC=400+20Q-2Q²+⅔Q³ A, find profit maximizing level of output and the maximum profit if the average revenue equals $180 B, calculate the shutdown level of output and price​

Which characteristics are true of the arabian desert? choose all answers that are correct. has land mostly below sea levelcovers almost the entire arabian peninsulacontains the largest sand sea in the worldhas very few people living there

What was one step that charlemagne took to unite his kingdom? a. he chose a single strong heir to inherit his throne. b. he drove muslim forces out of europe. c. he created and supported schools. d. he declared himself head of the catholic church.

What is the difference between the kurds and the shia muslims? a the kurds are a religious group while the shia muslims are an ethnic group. b the kurds and the shia muslims are religious groups. c the kurds are an ethnic group and the shia muslims are a religious group. d the kurds and the shia muslims are ethnic groups.