Which expression is not equal to the expression shown? 33 : 3-4
3 x 36
33 x 34
37 : 30
3-3 ÷ 34
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If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

W-16=-12 solve each one step equation plz

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.