1. The problem states that the angles 42° and c° are part of a right angle, which measures 90° in total. 2. The relationship between the angles inside a right angle is that their sum must equal 90°. 3. We can write the equation: $$42 + c = 90$$ 4. To find $c$, subtract 42 from both sides: $$c = 90 - 42$$ 5. Simplify the right side: $$c = 48$$ 6. Therefore, the value of $c$ is 48°. This means the two angles together perfectly form the right angle as expected.