Ariana starts with 100 milligrams of radioactive substance. The amount of the substance decreases by 20% each well for a number of weeks, w . The expression 100(1-0.2) finds the amount of radioactive substance remaining after w weeks. Which statement about this expression is true

.5 lb

step-by-step explanation:

12 in / 6 in =2 in

.25 x 2 = .5 lb

answer: 457.14

step-by-step explanation:

205 - 45 = 160

160 / .35 = 457.142857

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72 is the answer to this problem