Ｉ ᴰᵒ ʸᵒᵘ ʷᵃⁿᵗ ˢᵉᵉ ᵐʸ ᵇᵒᵒᵇˢ ᴰᵒⁿᵗ ʷᵒʳʳʸ ⁱᵗˢ ᶠᵒʳ ᶠʳᵉᵉ
ｈｅｒｅ
ᵇʳᵃⁱⁿˡʸ.ᵗᵒᵈᵃʸ

16 more than the product of 5 and p

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.

Maria found the least common multiple of 6 and 15. her work is shown below. multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, . . multiples of 15: 15, 30, 45, 60, . . the least common multiple is 60. what is maria's error?