For medical reasons, dyes may be injected into the bloodstream to determine the health of internal organs. In one study involving animals, the dye BSP was injected to assess the blood flow in the liver. The results are listed in the table, where x represents the elapsed time in minutes and y is the concentra- tion of the dye in the bloodstream in milligrams per milliliter.

(a) Find a function that models the data. 

(b) Estimate the elapsed time when the concentration of the dye reaches 30% of its initial concen- tration of 0.133 mg/mL. 

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1 y 0.102 M r 9 y 0.015 2 0.077 13 0.008 3 0.057 16 0.005 4 5 0.045 0.036 19 0.004 22 0.003 7 0.023