Just apply the Pythagoras Theorem,
LN² = LM² + MN²
LN² = 7² + 8²
LN² = 49 + 64
LN = √113
In short, Your Answer would be: Option D
Hope this helps!
The center of the circle is (3,9) so the answer is A
Step-by-step explanation:

6t+12-4t
Use the distribution property.
This is most likely the answer