The formula A = 18 – 0.82t give the amount, A, of an 18 mg dose of antibiotic remaining within a patient's bloods?

After 6 h, what amount of antibiotic remains in the blood stream?
Answer to two decimal places.
plz help i dont know what to do?
Answers:
Assuming the time is meant to be contained by hours (as opposed to minutes or days etc), you just put 6 in for t and the answer will describe you how much of the antibiotic dose is left.

A=18-0.82(6)
A=18-4.92
A=13.08mg

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