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a 10-volt battery connected across a parallel combination of a 100 (ohm) fixed resistor and a...

a 10-volt battery connected across a parallel combination of a 100 (ohm) fixed resistor and a variable resistor R. It can be shown that the total current in the circuit I (in amperes, A) is the following function of the variable resistor R (in ohms): I= ((100+R)/10R) If the variable resistance is decreased at a rate of 5 ohm/s, calculate the rate of change in the current with time when the variable resistance is 50 ohms.

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