Multiply and divide signed numbers and interpret sign patterns correctly.
Model repeated signed change with multiplication
Problem
A stock drops \(\$3~\text{each}~\text{day}\) for \(5~\text{days}\). Write the signed multiplication expression, and calculate the total change.
Big Picture
What this problem is really about
Translate one day’s drop as a negative change, while the number of days is the positive repetition count. Multiplication represents applying that same signed change five times, so determine the product’s sign from the factors and its magnitude from the absolute values. Interpret the product as the stock’s total dollar change, not its final price.
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