Question

write the expression. then, complete the statements. twice the difference of a number and seven
key words replace with
twice 2 ×
the difference of ( - )
a number n
seven 7
the word \twice\ means
the words \the difference of\ indicate
the expression is written as

Explanation:

Step1: Identify meaning of "twice"

"Twice" means 2 times, represented as $2\times$.

Step2: Identify meaning of "the difference of"

"The difference of" indicates subtraction, represented as $( - )$.

Step3: Form the expression

Let the number be $n$. The difference of a number $n$ and seven is $(n - 7)$. Twice this difference is $2\times(n - 7)$ or $2(n - 7)$.

Answer:

The word "twice" means $2\times$; The words "the difference of" indicate subtraction; The expression is written as $2(n - 7)$