Answer:
Part a) The reasoning in the procedure
Part b) The height of the building would be 225 feet
Explanation:
The complete question in the attached figure
Part a)
Let
x ------> height of the building
y -----> the number of floors
z ----> the ratio of height of the building to the number of floors

we have

substitute the values

To find out the unit rate divide the height of the building by the number of floors
so

That means ----> Each floor of the building has a height of 15 feet
Part b) How tall would the building be if it had 15 floors?
using proportion
Let
x -----> the height of the building
