Question

what is m∠1?
m∠1 = \square°
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Explanation:

Step1: Find triangle's third angle

The sum of angles in a triangle is $180^\circ$. Let the unknown interior angle be $x$.
$x = 180^\circ - 74^\circ - 73^\circ = 33^\circ$

Step2: Find supplementary angle $\angle1$

$\angle1$ and $x$ are supplementary (form a straight line).
$m\angle1 = 180^\circ - 33^\circ$

Answer:

$147^\circ$