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Sagot :
Explanation:
We are told that a notebook costs $3.50 and a binder costs $6.70
If we represent the number of notebooks to be n and binders to be m
Also, we are told that she bought 4 fewer notebooks than binders
Then, we can say that
[tex]n=m-4[/tex]The total amount spent can be obtained using the basic principle
[tex]Amount=cost\text{ per unit}\times quantity\text{ sold }[/tex]Therefore
we have
[tex]Total\text{ Amount}=3.50(n)+6.70(m)[/tex]But, we have established that n = m-4
Thus
[tex]Total\text{ amount =3.5\lparen m-4\rparen+6.7\lparen m\rparen}[/tex]The total amount in terms of the binders will be
[tex]\begin{gathered} 3.5m-14+6.7m \\ 3.5m+6.7m-14 \\ 10.2m-14 \end{gathered}[/tex]Thus,
we can also express the total amount in terms of the binders as
[tex]Total\text{ amount }=10.2m-14[/tex]
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