It would help to know which side is B, can you give a chart?
And I'm on my phone, I can't comment directly on the post, unless someone can tell me how.
The bes thing to do t find the scale factor is to divide the larger number by the smaller number. 260/13= 20 120/6= 20. As these are both the same, therefore, the scale factor is 20.
Hope this helps :)
Set up a ratio of height/ shadow
2.7/1.56 = x/38.25
Cross multiply:
1.56x = 103.275
Divide both sides by 1.56
X = 66.2
Round to nearest meter = 66
Answer: 66 meters
Add up all of the exponents

has a degree of
Answer: 8x=-2
The steps are in the photo below