Element X decays radioactively with a half life of 11 minutes. If there are 820 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 18 grams? y = a(0.5)^ t/h

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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is this part of a question or something

i am not sure :

step-by-step explanation: