Suppose the amount of a drug left in the body t hours after administration is $\frac { 20 } { ( t + 1 ) }$ mg. In mg=h, find the rate of decrease of the drug 4 hours after administration.

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The Answer of Suppose the amount of a drug left in the body t hours after administration is $\frac { 20 } { ( t + 1 ) }$ mg. In mg=h, find the rate of decrease of the drug 4 hours after administration.

Suppose the Amount of a Drug Left in the Body 20(t+1)\frac { 20 } { ( t + 1 ) }(t+1)20​

Suppose the Amount of a Drug Left in the Body $\frac { 20 } { ( t + 1 ) }$