The term that completes the blank and fits the description is an array
<h3>How to complete the blank?</h3>
From the question, we understand that:
- The variable term holds multiple values
- It uses square brackets
- it is defined by a single variable
The term that fits the above highlights is array
Hence, the complete statement is:
<em>array can hold multiple values within a single variable and is defined by having values between square brackets.</em>
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By definition of the binomial coefficient,

so we have

as required.
Answer:
7 books
Step-by-step explanation:
make an equation
x = # of books each book is $4 so its 4x
the shipping fee no matter how many books he buys will be $2 so it's just 2
the equation looks like this:
4x + 2 = 30
we set equal to 30 cuz he can't spend more than $30
solve for x
4x = 30 -2
4x = 28
x = 7
Brett can buy no more than 7 books.