Answer:

Step-by-step explanation:
see the attached figure to better understand the problem
we know that
In the right triangle ABC, the tangent of angle of 30 degrees is equal to divide the opposite side to the angle of 30 degrees (AC) by the adjacent side to the angle of 30 degrees (BC)

substitute the given values

Solve for b

Please translate to English so that I can help
54.60/3.90=14
Mark’s gas tank will fill up with 14 gallons of gas.
You will have to solve for x to know what x equals