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∠1 and ∠2 are supplementary angles, and ∠1 and ∠3 are complementary angles. given m∠1 is 28° less then ∠2, find m∠3.

Supplementary angles add up to 180 degrees
Complementary angles add up to 90 degrees

So if angle 2 is x
Then angle 1 is x - 28

And we can set up the equation

x + (x-28) = 180
2x - 28 = 180
2x = 208
x = 104

And then the second equation is:

Angle 1 + Angle 3 = 90

Angle 1 = 104 - 28 = 76

76 + Angle 3 = 90

Angle 3 = 14

So the angles are, again:

∠1 = 76
∠2 = 104
∠3 = 14