HELP PLEASE, I NEED TO PASS THIS QUIZ

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

How can you construct perpendicular lines and prove theorems about perpendicular lines