Ageologist finds a large rock containing a fern fossil this kind of furnace through on when in hot moist climates what does this tell geologist about the area at the time the rock was formed?

The market demand curve for a popular teen magazine is given by q = 80 - 10p where p is the magazine price in dollars per issue and q is the weekly magazine circulation in units of 10,000. if the circulation is 400,000 per week at the current price, what is the consumer surplus for a teen reader with maximum willingness to pay of $3 per issue?