Page 13 - ACE YR IGCSE A TOP APPR' TO MATHS

3 0.807

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4 9.16

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5 2.534

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Direct and inverse proportion

1 A is directly proportional to the square of B.
When A = 300, B = 10.

(a) Find a formula for A in terms of B.

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1
(b) Calculate the value of A when B = .
2

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2 r is directly proportional to square root of s + 2.
It is given that when s = 3, r = 5√5.
When s = 7, find the value of r.

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Cambridge IGCSE
TM
8 Ace Your Mathematics

Chapter 1A.indd 8 15/03/2022 10:27 AM