McGraw Hill Glencoe Algebra 1, 2012
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McGraw Hill Glencoe Algebra 1, 2012 View details
Practice Test
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Exercise 1 Page 67

The key phrase is "...more than..." This indicates that we should add two things.
The two terms that we are adding together are: "six" and "a number." There are two ways in which we can write it.
Let's choose the first option. When we say "a number," this is indicating an arbitrary number or a variable. If we call this number we can complete our expression.
Note that this is only one of multiple ways to algebraically express the given verbal expression.