Yep, any of the iPads currently being sold will handle the aforementioned tasks just fine. Honestly, even the 5-year old Air 2 does them fine albeit it's noticeably slower opening large books (e.g. 4000+ page omnibus).
The iPad 7 has the 3-year old A10 chipset while the Air 3 has the 1-year old A12. The iPad 7 isn't slow by any means. However, the Air 3 is noticeably snappier.
There's also storage to consider. 32GB is starting to get a bit cramped. 4-5GB is used by iOS and probably 2-5GB will be used for cache/tmp leaving just ~20GB or so usable. If one needs more than 32GB but less than 64GB, the price gap between iPad 7 128GB and iPad Air 3 64GB drops down to $80 making the Air 3 a bit more attractive. Of course, this might vary based on currently running promos/discounts.