Please help me on Probability

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

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

Susie wants to take her friend out for lunch. she wants to spend $9.75 each person. how much will she spend in all.