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A metallic disc is being heated. Its are...

A metallic disc is being heated. Its area A(in `m^2`) at any time t(in second) is given by `A=5t^2+4t+8`. Calculate the rate of increase in area at `t=3s`.

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To find the rate of increase in the area of the metallic disc at \( t = 3 \) seconds, we will follow these steps: **Step 1: Write down the expression for the area.** The area \( A \) of the disc at any time \( t \) is given by: \[ A = 5t^2 + 4t + 8 \] ...
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