rosie collected $120 for her birthday.she then added to this amount by saving money from her part-time job at aconstant rate each month. By the end of the third month she had saved $795.what equation would best fit this situation?

The rate she gets money from part time job can be assigned to a variable, say m.

The initial sum, added the amount of money she gets in total for all the months gives the final amount of money she's got.

There are 3 months of work; so, the total obtained from the part time job is 3m.

All in all, you get:

120 + 3m = 795

Does that make sense?

Thanks