If emma wants to leave a 16% tip for the waitress, how much money should she add to the total bill of $27.98? what is the total after she adds the tip? ( explain your answer)

The highest point on earth is the peak of mount everest if you climb to the top you would be approximately 29,035 feet above sea level at remembering that amount is 5280 feet percentage of the height of the mountain would you have to climb to reach a point 2 miles above sea level

Can someone check if i did this correct. it’s number 4 if you’re wondering.

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25