Car security alarms go off at a mean rate of 4.0 per hour in a large costco parking lot. find the probability that in an hour there will be (round your answers to 4 decimal places.) probability (a) no alarms .0183 correct (b) fewer than two alarms .0916 correct (c) more than seven alarms .0511 correct

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.