Find an angle's measure when given the measures of its parts.


When Ranim started taekwondo, her highest kick went 110, degree from the ground. Her instructor asked her to practice until her highest kick goes 155, degree from the ground.
Which equation will tell us the measure of the additional angle, a, that Ranim's kick needs to go to reach 155, degree from the ground?
Please choose from one of the following options.