1.The cost c varies inversely as the number n of pencils. 2. The pressure P of a gas varies directly as its temperature t and inversely as its volume V. 3. The area A of a parallelogram varies jointly as the base b and altitude h. 4. The rate r at which a person types a certain manuscript varies inversely as the time t spent in typing. 5. The amount of gasoline G used by a car varies jointly as the distance d travelled and the square root of the speed s and inversely as the square of time t.

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