PEople of Just a quick warning that there is someone posting links with virus. Feluka is his user name and he is posting links that give you viruses. DONT TRUST LINKS.

THIS is the link PLS DONT CLICK IT cutt. ly/nz6VGda
If you see this link dont click it. IT will send a virus.

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.