Engineering notation for (4.4x10^9)(-7.0x10^3)

Anyone know? will mark brainliest if you're correct!

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

Anew shopping mall is gaining in popularity. every day since it opened, the number of shoppers is 5% more than the number of shoppers the day before. the total number of shoppers over the first 10 days is 1258 how many shoppers were on the first day?