Not sure how to find range for these, anyone know??

Nine more than four times a number is the same as one less than twice the number. find the number?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

An initial investment of $100 is now valued at $150. the annual interest rate is 5%, compounded continuously. the equation 100e0.05t = 150 represents the situation, where t is the number of years the money has been invested. about how long has the money been invested? use your calculator and round to the nearest whole number. years