Adrain wants her is lawn to ben mown. three men apply for the task. the first man can mow the lawn in 6 hours the econ day man can mow the lawn in 4 hours and the third can mow the lawn in 3 hour. how long will it take for the men to complete the task

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.