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irinina [24]
3 years ago
8

I’ve been having trouble with this question as I haven’t learnt it yet.

Mathematics
1 answer:
ELEN [110]3 years ago
8 0

R = \frac{18}{5} = 3.6 and A = 2

given that R is inversely proportional to A, then

R = \frac{k}{A} ← k is the constant of variation

To find k use the condition R = 12 when A = 1.5

k = RA = 12 × 1.5 = 18

the equation is therefore

R = \frac{18}{A}

when A = 5, then

R = \frac{18}{5} = 3.6

when R = 9, then

9 = \frac{18}{A} ( multiply both sides by A )

9A = 18 ( divide both sides by 9 )

A = 2



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