52 is the perimeter because 13x13=169 and 13+13+13+13=52
3x - 12x - 5x
= 3x - 17x
= - 14x
answer
-14x
From the given data, it is clear that the first area model represents the fraction 
From the second area model,
Total number of regions = 6
Number of shaded regions = 2
The fraction represented by the model = 
Let's complete the expression.

Answer:
Cone and cylinder are the two solid shapes which are when joined together form a new shape that has three faces, two edges and one vertex.