The equation is: [tex]960d-650d=52000[/tex] and Julianne will begin making a profit after 168 days.
Explanation
Her total start-up cost is $52,000.
Each day, she spends $650 on operating costs (like utilities and wages) and she earns $960 per day from her students' lesson fees.
If the number of days to overcome the start-up cost is [tex]d[/tex] , then
the total operation cost spent in [tex]d[/tex] days [tex]= \$650d[/tex] and
the total students' lesson fees earned in [tex]d[/tex] days [tex]= \$960d[/tex]
Part A: The equation to represent the situation will be: [tex]960d-650d=52000[/tex]
Part B: Julianne will begin making a profit when....
[tex]960d-650d>52000\\ \\ 310d>52000\\ \\ d>\frac{52000}{310}\\ \\ d >167.741... \approx 168[/tex]
So, Julianne will begin making a profit after 168 days.