Apps. and Interpretation for IBDP Maths Ebook 1 | Page 59

3. The number of flats y can be modelled by the equation y � pt � q , where t is the
number of years after 1 January, 2010.
On 1 January 2012, the number of flats is 18000. On 1 January 2017, the number of flats
is 22000.
(a) Find the values of p and q .
(b) State the meaning of p in this context.
(c) State the meaning of q in this context.
[4]
[1]
[1]
4. Laurent can buy 10 CDs and 7 DVDs for USD 76.5, and he can buy 8 CDs and 11 DVDs
for USD 90.9.
6
(a)
(b)
Find the price of one CD and that of one DVD.
[4]
Laurent wants to buy 7 CDs and 10 DVDs. Find the amount of change if he pays
USD 100 at the counter.
[2]
www.seprodstore.com
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