simplify 8 . 9 - 2 . 5

8.9 - 2.5 = 7.64

To simplify the expression 8.9 - 2.5, follow the order of operations, which is Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

First, perform the multiplication:
8.9 - 2.5 = 79.1 - 2.5

Then, subtract the two values:
79.1 - 2.5 = 76.6

Therefore, the simplified expression is 76.6.