Please help the questions are in the picture above

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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

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?