Question

solve for a

Explanation:

Step1: Use triangle angle sum property

For the left triangle, the sum of angles is $180^\circ$. Calculate the third angle adjacent to $a$:
$180^\circ - 33^\circ - 70^\circ = 77^\circ$

Step2: Use supplementary angle relationship

Angle $a$ and the $77^\circ$ angle are supplementary (form a straight line):
$a = 180^\circ - 77^\circ$

Answer:

$103^\circ$