I think it is A but make sure with someone else
Answer:
Using Pythagoras Theorem, squareroot 15^2 - 5^2.
After you found the opposite length, use the cosine rule to find angle x.
Answer:
6x - 5
Step-by-step explanation:

80 c, 80%, 80/100, .80
$1.20, 120%, 120/100, 1.2
$1.60, 160%, 160/100, 1.6
$1.28, 128%, 128/100, 1.28