how would you get on a back elephant ? is correct question

Yes. No grammar issues.
But maybe"the back of a elephant" is more accurate than "a back elephant."

* Which sentence listed below is grammatically incorrect?
The government will issue new tax regulations next week.
All rules must be strictly observed.
Do you know weather they will make any price changes?

Help!!
Which sentence listed below is grammatically incorrect?
The government will issue new tax regulations next week.
All rules must be strictly observed.
Do you know weather they will make any price change?
Its the last one right?

Last two sentences have wrong words:
Do you know weather (should be whether) they will make any price change?
Its (should be It's) the last one right?

Here's a lesson on wether, weather and whether.

Yup, there's a word wether - it's a castrated ram.