Tell which number is greater. 50%, 13/25 HELP M

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

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?

See attachment below and find the equivalent of tan(∠qsr)