Solve the problem. Round your answer to three decimals. 19) How long will it take for an investment to double in value if it earns 7.75% compounded continuously? Solve the problem. 20) Conservationists tagged 150 black-nosed rabbits in a national forest in 1990. In 1991, they tagged 300 black-nosed rabbits in the same range. If the rabbit population follows the exponential law, how many rabbits will be in the range 9 years from 1990