Plz help this is due today

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

How do you find the area of a triangle

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?