1 1Suppose the euppty and demand for a certain textbook are given by supply: p = Eq2. demand: p = — §q2 +311 where p is the price and q is the quantity. Frnd the demand quantrty and the supply quantity at a price of $15. The number of books that are demanded at a pnce ot$15 is El and the number of booke supplied at a price of $15 i5 |:|.(Round to the nearest whole number as needed.)