The half-life of a radioactive substance is 20 years. If you start with some amount of this substance, what fraction will remain in 120 years?

1/64

Step-by-step explanation:

20 years = 1/2

40 years = 1/4

60 years = 1/8

80 years = 1/16

100 years = 1/32

120 years = 1/64

the range is 19

step-by-step explanation:

the range is biggest number minus the smallest, so in this case it would be

41 - 22 = 19

i think there was a typo. you wrote pat brings 3 quarts of ice-cream to the party. each serving of ice-cream is 1 6 quart. how many total servings of ice-cream does pat bring to the party? i think the bold is supposed to be 1/6. so 1 quart of ice cream = 6 servings. 6 * 3 = 18.