Final answer:
To find the measure of the complement of ∠k, subtract the measure of ∠k from 90 degrees.
Step-by-step explanation:
To find the measure of the complement of ∠k, we need to find the complement of the given angle, which is 90° minus the measure of ∠k.
Therefore, the measure of the complement of ∠k is 90° - (5x + 13)°.
For example, if the measure of ∠k is 20°, then the measure of its complement would be 90° - (20°) = 70°.