a. We have the following from the diagram
Figure 1 : 1 blue triangle
Figure 2 : 3 blue triangles
Figure 3: 9 blue triangles
Figure 4: 27 blue triangles
We can derive an explicit function for the sequence to be:

b. The number of triangles in the 14th figure
Here we substitute 14 for n into the explicit function

There would be 1 594 323 triangles in the 14th figure
c. Given that:

Our explicit function:

The explicit function is multiplied by a factor of 1/3.
Hence, it has been compressed vertically by a factor of 1/3