Answer:
∠b=23°
Explanation:
∠a+∠b=90°
67°+∠b=90°
Subtract 67° from both sides
<b = 23°
<a and <b are complementary so they add up to 90
<a + <b = 90
Where <a = 67
67 + <b = 90
<b = 90 - 67
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