Apps. and Interpretation for IBDP Maths Ebook 1 | Page 50

Your Practice Set – Applications and Interpretation for IBDP Mathematics
4. The amount of electric charge A stored in a battery of a tablet computer is modelled by
t
A()
t � p � q , where p and q are positive constants, and t is the time in hours for the
battery to be charged.
(a) Interpret the term ( p � 1) represents in this context.
[1]
The amount of electric charge at t � 0 and t � 3 are 4 units and 4.488 units respectively.
(b) Find the values of p and q .
[4]
To use the tablet computer to watch an online concert, an electric charge of 4.3 units is
needed.
(c) Find the time required for the tablet computer to reach an electric charge of 4.3
units.
[2]
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