5. MEDICINE When doctors prescribe medication,

they have to consider the rate at which the body filters

a drug from the bloodstream. Suppose it takes the

human body 6 days to filter out half of the Flu-B-

Gone vaccine. The amount of Flu-B-Gone vaccine

remaining in the bloodstream x days after an injection

is given by the equation y = y(0.5), where y, is the

initial amount. Suppose a doctor injects a patient with

20 ug (micrograms) of Flu-B-Gone.

a. How much of the vaccine will remain after 1 day?

Round your answer to the nearest tenth.

b. How much of the vaccine will remain after 12 days?

Round your answer to the nearest tenth.