Answer:
21
Step-by-step explanation:
This is a special triangle with the angles being 30-60-90 where the adjacent side to angle of 30 degrees is y * sqrt(3) and the opposite side is y and the hypotenuse is 2y. So the opposite side of 30 degrees is 7 * sqrt(3) which is y and will be plugged into the equation y * sqrt(3) to find x. This gives you the value: (7 * sqrt(3)) * sqrt(3) which gives you 7 * 3 which is equal to 21.
