Michelle has lived in her new apartment for 8 months.
How to find how long she stayed
Say m = the number of months Michelle has lived in her new apartment.
The non-refundable deposit per pet is $40. So, the total amount spent on pet deposits is
= 2 * 40
= $ 80
The total amount spent on rent and pet deposits is $ 6,080.
The equation representing the total cost is
750m + 80 = 6,080
750m = 6,000
m = 6000 / 750
m = 8