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I really don't understand this lesson can you help me please

I Really Dont Understand This Lesson Can You Help Me Please class=

Sagot :

Data:

M = Math books

E = Englisg books

TB = Total books

The total of the books is the addition of the math and english books

[tex]TB\text{ = M+ E}[/tex]

The Math books are: M= E-9 (Nine less that English books (E))

So replacing this in the expression for Total Books:

[tex]TB=(E-9)+E\text{ }\Rightarrow TB=E-9+E[/tex]The final expression is:

[tex]TB=2E-9[/tex]

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