need math help

1.4

Root 2 ia not exactly 1.4, that is an approximation

root2 is an irrational number which means that it cannot be written exactly as a fraction or a decimal. It can't even be written exactly as a recurring decimal, the numbers after the point would just keep going for ever and would not even form a repeating pattern.

Look up calculator on google and do the rest of your problems.

Just use the caculator here