46. An experiment is conducted relating the time in hours and the amount of a drug remaining in the bloodstream. The following data points were recorded: $(1, 10), (3, 9), (5, 7), (6, 5), (7, 3), (9, 1)$ . How many milligrams of the drug remain in the bloodstream after 5 hours?
(a) 3 milligrams
(b) 7 milligrams
(c) 6 milligrams
(d) 9 milligrams.

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Answer

$(b) 7 milligrams$

Steps

Step 1 ： $Given the data points, find the value of the drug remaining in the bloodstream at 5 hours.$

Step 2 ： $Data point at 5 hours is (5, 7)$ .

Step 3 ： $(b) 7 milligrams$