32:00
1 of 5
Papers 1 and 2 · Pure
6.7 Exponentials and logarithms
Question 1 · 4 marks
Calculator allowed
Spec and skills
Paper scope: Pure 1/2
Spec P6.7
Spec OT3.4
Original practice question
After a patient is given a drug, the mass of the drug in the bloodstream,
m
m
m
mg,
t
t
t
hours later is modelled by
m
=
25
e
−
0.2
t
m = 25e^{-0.2t}
m
=
25
e
−
0.2
t
.
(a)
Write down the mass of the dose given.
1 mark
mg