Answer:
Meghan should babysit for 12 hours
Explanation:
 Meghan is soon going to have to spend $78.99 on a dress, $32.50 on shoes, $25 for the ticket and $50 for dinner.
 Meghan already has $52 from her savings to spend. She earns money from babysitting at $12 each hour.
 Let the number of hours Meghan babysits be denoted by 
 .
.
From 
 hours of babysitting, Meghan earns $(
 hours of babysitting, Meghan earns $(
 ).
).
So, her total earnings sum up to 
 . This should be greater than total spendings.
. This should be greater than total spendings.
 

So, Meghan must work for 12 hours so she has something left after spendings.
∴ Meghan must babysit for 12 hours.