standard_description: (+)Derive the equations of ellipses and hyperbolas given the foci, using the fact that the sum or difference of distances from the foci is constant.
problem_activity: Task
Pia was having a party. She put 10 stickers in each party bag.
On the first day she made 10 bags. How many stickers were in her 10 bags all together?
On the second day she made 3 more bags with ten stickers in each one. How many stickers total were in her 10 bags plus 3 more bags?
On the third day she made 7 more bags with ten stickers in each one. How many stickers total are in her 20 bags of ten?
On the fourth day, she made another 10 bags with ten stickers in each one. How many stickers are in her 30 bags of ten?
After one week, she had made a total of 50 bags with ten stickers in each one. How many stickers total are in her 50 bags of ten?


aligns: no