Answer:
(D) 
Step-by-step explanation:
Given: In triangle ABC, a=9, c=5 and ∠B=120°.
To find: The value of
.
solution: It is given that In triangle ABC, a=9, c=5 and ∠B=120°.
Now, using the law of cosines, we get

Substituting the given values, we get




which is the required value of
.
Therefore, option D is correct.
Answer:
50
Step-by-step explanation:
could i have brainliest plz i need one more thx
If it is about finding the variable you need to distribute for #2 and #3. Get the variable by itself.