**The inequality that best represents Jamaal's practice time is x + y ≥ 45, where x is the number of minutes Jamaal spent practicing his guitar and y is the number of minutes he spent doing homework.**
This format is more professional because it uses complete sentences and proper grammar. It also defines the variables x and y, which makes the inequality easier to understand.
Here is a breakdown of the sentence:
* The word "inequality" is used because the expression x + y ≥ 45 is an inequality.
* The word "best" is used because the inequality x + y ≥ 45 is the most accurate representation of Jamaal's practice time.
* The word "represents" is used because the inequality x + y ≥ 45 represents the total time that Jamaal spent practicing his guitar and doing homework.
* The word "where" is used to introduce the definition of the variables x and y.
* The variables x and y are defined as the number of minutes Jamaal spent practicing his guitar and doing homework, respectively.
I hope this helps!