We are asked to make an algebraic expression for the given verbal expression. The key phrase is the difference of ... and .... This indicates that we should subtract one term from another one.
... -...
The two terms that we are subtracting are anumbert and 9. Since anumbert comes first in the verbal expression, it should be on the left-hand side of the subtraction.
numbert - 9
When we say a number, this is indicating an arbitrary number or a variable. If we write this number as t, we can complete our expression.
the difference& of a numbert and 9 [0.2em]
& t - 9
Note that this is only one of multiple ways to algebraically express the given verbal expression.
