Answer
$t=60^{\circ}$
Work Step by Step
Since April represents $x=3$, we substitute $x=3$ in the equation,
$t=60-30\cos(\frac{\pi}{6}x)$
$t=60-30\cos(\frac{\pi}{6}\times3)$
$t=60-30\cos(\frac{\pi}{2})$
$t=60-30(0)$
$t=60^{\circ}$
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