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11 October, 01:24

The cost of a phone call is c pence which is calculated using the formula c=20+5m where m is the number of minutes the phone call lasted find the value of c when 1) m=1 2) m=5 3) m=12

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  1. 11 October, 01:44
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    I believe the answer is 25 because it says that 2) m=5 or it may be 30 because 5times 2 equals 10 and 10plus 20 gives you 30
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