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Given that C varies partly as A and partly as the square of A and that C=20 when A=2 and C=21 when A=3,determine the value of C when A=4.
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Jul 21, 2021
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Mathematics Form 1
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anonymous
Given that C varies partly as A and partly as the square of A and that C=20 when A=2 and C=21 when A=3,determine the value of C when A=4.
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Jul 21, 2021
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anonymous
C=hA+KA
2
20=2h+4k
21=3h+9k
K=-3 h=16
C=16a-3a
2
64-48
=16
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