Final answer:
To solve the expression 8.7 + [2.7 - (4 * 0.5)] * 9, follow the order of operations. Solve the innermost parentheses, then the expression within the square brackets. Multiply and add to get the final answer, which is 15.
Step-by-step explanation:
To solve the expression 8.7 + [2.7 - (4 * 0.5)] * 9, we need to follow the order of operations, which is parentheses, multiplication/division, and addition/subtraction.
First, solve the expression within the innermost parentheses, which is 4 * 0.5 = 2.
Now, the expression becomes 8.7 + [2.7 - 2] * 9. Next, solve the expression within the square brackets, which is 2.7 - 2 = 0.7.
Finally, the expression becomes 8.7 + 0.7 * 9. Multiply 0.7 by 9 to get 6.3. Then, add 8.7 and 6.3 to get the final answer, which is 15.