Brandon has a certain amount of pencils, p. Sophie has 7 fewer pencils than Brandon. How do you write an expression that represents how many pencils Sophie has?
Compare the amount of Sophie's pencils to Brandon.
Brandons amount of pencils is
Since Sophie has 7 less than Brandon, that means that she has
S = p - 7 pencils
See explanation. The layout is very important for good mathematics
Let Brandon be B
Let Sophie be S
Given that Brandon's count of pencils is p
B = p pencils
(Note that units are important and 'pencils' is units of measurement/count)
Then S = p -7 pencils