An individual's demand curve: a. represents the various quantities that a consumer is willing to purchase of a good at various price levels. b. will shift if preferences, prices of other goods, or income change. c. all of these answers are correct. d. is derived from an individual's indifference curve map.

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.

answer; coefficient of correlation;

answer; advertising;