What is the sum of the roots of the equation √10-x+3/√10-x-4? (Clarification: 3/√10-x is a fraction. 3 is the numerator and √10-x is the denominator. √10-x+ and -4 are not apart of the fraction.)

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?