Answer:

Step-by-step explanation:
We have the equation of the position of the object

We need to solve the equation for the variable a

Subtract
and
on both sides of the equality


multiply by 2 on both sides of equality


Divide between
on both sides of the equation

Finally

I believe it's the 3rd one
Angles in a triangle add up to 180 therefore:
Angle CAB = 180 - 60 - 50 = 70
Angles on a straight line add up to 180 therefore the missing angle is:
180 -70 = 110
Answer is D
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That's the answer to your question.