What is the coefficient of the x⁶y³ term in the expansion of (x + 2y)⁹?

When 142 is added to a number the result is 64 more times the number my options are 35 37 39 41

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

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?