QCEVault

Exponential functions — Question 230

Original QCE Vault practice · 4 marks

Q230 · Practice questionTechnology-activeComplex familiar4 marks

QUESTION 230 (4 marks)

A medication concentration is modelled by C(t)=18e−0.22tmgL−1C(t)=18e^{-0.22t} mg L^{-1} for t≥0t\ge 0.
a)
Find the half-life.
[2 marks]
b)
Find when the concentration first falls below 4.0mgL−14.0 mg L^{-1}.
[2 marks]
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