I believe the anwser to this question is -19
Answer:
Option A. 
Step-by-step explanation:
we have

Applying the distributive property

Are you asking for the letter or what the line is called because if it's just the letter then it is r if it is the name then its a plane intersect.
The combined area of these three rooms is 189 ft².
Therefore we have the equation
4x + 3x + 2x = 189
9x = 189 |:9
x = 21 ft²
area of the kitchen = 4x = 4(21) = 84 ft²
area of the playroom = 3x = 3(21) = 63 ft²
area of the dinning room = 2x = 2(21) = 42 ft²