Answer
$$y=-6+11 e^{4t}$$
Work Step by Step
The general solution of $y'=4y+24=4(y+6)$ is
$$y=-6+c e^{4t}.$$
When $y(0)=5$, then $5=-6+c$, i.e. $c=5+6=11$. Thus:
$$y=-6+11 e^{4t}$$
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