Pls help I’m struggling in math at the moment

Which expression is rational? 6. , square root two, square root 14, square root 49

Landon wrote that 3−2.6=4. which statement about his answer is true?

Question 13 (1 point) jerome is starting a new job. his contract states he will earn $42,000 the first year, and will get a 4% raise per year. which function s(x) represents jerome's salary after a certain number of years, x?