A certain radioactive isotope has a half-life of 4.28 minutes. If we initially have 7168 grams of this substance, how many half-lives will pass until 7 grams remain? Your answer should be a whole number.

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6

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66

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6

66answer:

step-by-step explanation:

total amount to be paid = $19.5

step-by-step explanation:

given ,

original price = $25.99

discount = 25%

discount amount = 25% of original price

discount amount = 25/100   * 25.99

discount amount = $6.49

hence , the total amount to be paid = original price - discount amount

                                                            = $25.99 - $6.49

                                                            =$19.5

total amount to be paid = $19.5