Statistics students in Oxnard College sampled 9 textbooks in the Condor bookstore and recorded the number of pages in each textbook and its cost. The bivariate data are shown below:

Number of Pages (xx)	Cost(yy)
358	15.9
810	41.5
948	60.4
803	40.15
248	7.4
315	29.75
523	29.15
513	22.65
372	16.6

A student calculates a linear model yy = xx + . (Please show your answers to two decimal places) Use the model to estimate the cost when number of pages is 404. Cost = $ (Please show your answer to 2 decimal places.)