Which properties did jacques use to solve the following problem? (you may select more than one answer) 1 x (6 + 28) (1x6) + (1x28) 6 +28 34 1.distributive property 2. identity property of addition 3. assoc property of addition 4. identity property of multilpilication

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.