Chapter 2 - Section 2.5 - An Introduction to Problem Solving - Exercise Set - Page 165: 5

The number is $18$.

Work Step by Step

Let $x$ = the unknown number Then "the product of 7 and a number" means $7(x)$. Thus, the equation that represents the situation is: $7(x)=126$ Divide 7 on both sides of the equation to obtain: $x=\frac{126}{7} \\x=18$

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