To solve the expression \(-42 - 45.5 \times 7\), you should follow the order of operations, often referred to as PEMDAS (Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right)).

1. First, perform the multiplication:
   \[
   45.5 \times 7 = 318.5
   \]

2. Then, perform the subtraction:
   \[
   -42 - 318.5 = -360.5
   \]

So, the result of \(-42 - 45.5 \times 7\) is \(-360.5\).

Would you like to go over any specific steps, or do you have any questions?

Here are some related questions you might find helpful:

1. How would you solve an expression with multiple operations, including parentheses?
2. What happens if you switch the order of operations in a calculation?
3. How do negative numbers affect multiplication and subtraction?
4. What is the importance of understanding the order of operations?
5. How would you solve a similar problem with division instead of multiplication?

**Tip:** Always remember to follow the order of operations carefully to avoid mistakes in calculations.

Learn how to solve the expression -42 - 45.5 × 7 step-by-step with a detailed explanation following the order of operations. This problem involves multiplication of real numbers and subtraction of real numbers. Suitable for students in Grades 7-9.

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