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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Home » Mathematics » 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