The work of ibn khaldun is important because a. his writings on aristotle influenced christian scholars in medieval europe. b. he wrote a book that was translated into latin and became the standard mathematics textbook in europe. c. he set standards for the scientific study of history. d. his work pioneered the study of measles.

both are true, the congress does have the power to create banks, even if this power is not specifically described in the constitution, since there is nothing restricting it and there is power given to the congress to make "all laws which shall be necessary and proper". maryland was not allowed to tax a branch of the national bank operating there, and the supreme court decided that no state could. both of these topics were discussed in a decision of the mcculloch v. maryland case in 1819.

deseasie in europe