1+1+9-104+7+18-207
This mathematics problem involves applying core mathematical principles and formulas. Below you will find a complete step-by-step solution with detailed explanations for each step, helping you understand not just the answer but the method behind it.
ScanSolve AI Answer
Step 1: Perform multiplication.
$$1 + 1 + 9 - 10 \times 4 + 7 + 18 - 20 \times 7$$
$$1 + 1 + 9 - 40 + 7 + 18 - 140$$
Step 2: Perform addition and subtraction from left to right.
$$2 + 9 - 40 + 7 + 18 - 140$$
$$11 - 40 + 7 + 18 - 140$$
$$-29 + 7 + 18 - 140$$
$$-22 + 18 - 140$$
$$-4 - 140$$
$$-144$$
The final answer is $\boxed{-144}$.
