Can someone help me please

Can (2,3 and square root 10) be sides ona right triangle?

The diameter of a circular chip is doubled to use in a new board game. the area of the new chip will be

12. the amount of money in a bank account decreased by 21.5% over the last year. if the amount of money at the beginning of the year is represented by ‘n', write 3 equivalent expressions to represent the amount of money in the bank account after the decrease?