Answer:
(1,800 - 12g) / 30 = m
Explanation:
$ 1,800 is her goal.
She earns $12 per hour working at a store.
She earns $30 per lawn mowed
g represents the hours Tina works in the grocery store
m represents the number of lawns mowed
Tina only needs to know the m value as she knows how many hours she is scheduled to work in the grocery store. So, we need to leave the m value alone in one side of the equation.