Problems from Derivative of the linear function

Development:

$f(x)=5(x+3)=5x+15$

The derivative of a linear function $f(x)=Ax+B$ is equal to $A$. Therefore, $A=5$ and $B=15$, so, $f^{\prime }(x)=5$.

Solution:

$f^{\prime }(x)=5$

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