Here is an inflated swimming ring with dimensions in centimetres. The volume of the ring, V cm”, is given by
b
V = 0.251²(b − a)?(b + a)
a
Work out the volume when a = 35 and b = 45
Give your answer to 3 significant figures.
Total marks: 3
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Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

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What number is 7 units left of -15?