Write the Word or Phrase That Best Completes Each Statement $p = 25 \cdot 0.89 q$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
-A music store manager collected data regarding price and quantity demanded of cassette tapes every week for 10 weeks, and found that the exponential function of best fit to the data was $p = 25 \cdot 0.89 q$ . Express the function of best fit in the form $\mathrm { p } = \mathrm { p } _ { 0 } \mathrm { e } ^ { \mathrm { kq } }$ , and use this expression to predict the quantity demanded if the price is $\$ 8.50$ .