Remember that complementary angles are angles whose measures add up to 90 degrees.
Let's call the angle's complement x.
Then form the info given, we know that the measure of the other angle is (x + 28)
Therefore, the sum of the two angles must equal 90 degrees in order for them to be complementary. We now have:
x + (x + 28) = 90
Can you solve this equation for x, Saif?