Answer:
11 weeks
Explanation:
she already has $8 so subtract that from $57.50:
57.5 - 8 = 49.5
so she needs to save $49.5. set up the problem like this, where x is the number of weeks needed:
4.5x = 49.5
divide each side by 4.5:
x = 11
it will take her 11 weeks.