Final answer:
Without context, TR (915) - TR (895) cannot be calculated. In mathematics, if TR were a function, we would evaluate TR at both points and subtract. Additional information is required if TR relates to another subject. TR(915) - TR(895) = 915 - 895 = 20
Step-by-step explanation:
The equation TR (915) - TR (895) appears to involve a function TR evaluated at two different points, 915 and 895. Without additional context, it is impossible to determine what this function represents or how to evaluate it. However, if TR is a typical function in mathematics, you would simply evaluate the function at each point and subtract the second value from the first. For example, if TR(x) = x, then TR(915) - TR(895) = 915 - 895 = 20. If TR is not specified as a mathematical function and relates to other subjects like physics or biology, we would need more information to resolve the expression.