If alex had saved 333.34 a month for three months, how much money would he have? If he had used his savings instead of his credit card, how much less money would his purchases have cost him?

I don't know the answer but you have to add 333.34 3 times or multiply it 3 times.  I don't know the 2nd question.

i'm assuming it's looking for the missing length, which should be 4cm

hope this !

i'm pretty sure it's 477,585,296, but perhaps my math is incorrect.