How do I do this? I’m not really sure. Anyways thank you!

What number should be added to both sides of the equation to complete this square? x^2-10x=7

Areal estate agent earns $32,000 a year plus $1,000 for each apartment he sells. write an equation that shows the relationship between the number of apartments abe sells,n, and the total amount he earns in a year,e. what is the total amount abe would earn from selling 10 apartments in one year

Which ordered pair is a solution to the system of linear equations? 2x + 3y= 6 –3x + 5y = 10