To simplify the expression [(15+5)/5-2]•9, we follow the order of operations (also known as PEMDAS: Parentheses, Exponents, Multiplication and Division from left to right, and Addition and Subtraction from left to right).
[(15+5)/5-2]•9
First, we simplify what is inside the parentheses:
(15 + 5) = 20
Now we substitute the simplified value back into the expression:
[20/5 - 2] • 9
Next, we perform the division inside the brackets:
20/5 = 4
Substituting the result:
[4 - 2] • 9
Next, we perform the subtraction inside the brackets:
4 - 2 = 2
Substituting the result:
2 • 9
Finally, we perform the multiplication:
2 • 9 = 18
Therefore, the simplified value of the expression [(15+5)/5-2]•9 is 18.