Question

which symbol should be used to write this phrase as an algebraic expression? the product of an unknown quantity and 7

Explanation:

Step1: Analyze the phrase

The phrase is "the product of an unknown quantity and 7". In algebra, the product operation is represented by multiplication.

Step2: Identify the symbol

The multiplication symbol (×) is used to represent the product of two quantities. The '+' is for addition and '-' is for subtraction, so the correct symbol is '×'.

Answer:

The symbol '×' (the one labeled with 'x' in the image, the middle symbol among the three shown)