Hi, SRK22! Thanks for your question and photos.
First, YES!, it is possible to fix the gap between your teeth. The cost of the total treatment will depend on how long you're in treatment. You would need a comprehensive exam to evaluate that. Most orthodontic specialists provide complimentary...
It does appear that your lower jaw is slightly shorter that would be considered "perfect" for your upper. Your teeth have compensated for this so they "fit perfectly" in back.
Neither braces or invisalign will change your jaw position. Both braces and invisalign move teeth...
Invisalign® has some competition and has been improving its line of products, so yes; the new method from Invisalign® is swapping your Invisalign® clear plastic aligners out every 7 days instead of every 14 days.
Good luck with your procedure and the results!
