You need to add what the lines are if you want them to be analysed for you^^
Answer:
When
and
:

Step-by-step explanation:
-8ab can be seen as -8×a×b. Insert the given values:

Simplify multiplication from left to right:

Insert and solve:

:Done
Answer:
28.27
circumference of finding a circle divided by two.

(2×3.14×9)/2
56.55/2
28.27