Final answer:
To find mLSTU, we need to find the value of x and substitute it into the equation for mSTU.
Step-by-step explanation:
To find mLSTU, we need to find the value of x. First, we know that angles in a triangle add up to 180°, so we can set up an equation:
(× + 5)° + (2x + 16)° + (6x - 9)° = 180°
Simplifying and solving for x gives us x = 10. Substituting x back into the equation for mSTU, we get:
mLSTU = (2(10) + 16)° = 36°