a stack of cards are numbered from 1-50 . if a student selects a card what is the probibilty that the student will select a card that has both the same number in the ones place and the tens place. Write answer in decimal.(no links please) if so please write it out,,

20%

step-by-step explanation:

19

step-by-step explanation:

ending amount = beginning amount / (2^n)

where "n" = number of half-lives (or elapsed time / half-life)

ending amount = 50 mg / (2 ^10 / 5.3)

ending amount = 50 mg / (2 ^ 1.8867924528)

ending amount = 50 m / 3.6981210597

ending amount = 13.5203794557 mg

or about 13.5 mg remain

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