![subject](/tpl/images/cats/mat.png)
Mathematics, 12.11.2019 03:31 asia4772
An unknown radioactive element decays into non-radioactive substances. in 440 days the radioactivity of a sample decreases by 74 percent.
(a) what is the half-life of the element?
half-life: (days)
(b) how long will it take for a sample of 100 mg to decay to 91 mg?
time needed: (days)
![ansver](/tpl/images/cats/User.png)
Answers: 3
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 14:00, holaadios222lol
Which expression is equivalent to? assume x > 0 and y > 0.
Answers: 1
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 20:30, kaliyaht01
The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96
Answers: 2
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 21:30, gigi6653
Damon makes 20 cups of lemonade by mixing lemon juice and water. the ratio of lemon juice to water is shown in the tape diagram. lemon juice\text{lemon juice} lemon juice water\text{water} water how much lemon juice did damon use in the lemonade? cups
Answers: 3
You know the right answer?
An unknown radioactive element decays into non-radioactive substances. in 440 days the radioactivity...
Questions in other subjects:
![Konu](/tpl/images/cats/mat.png)
Mathematics, 12.07.2019 08:30
![Konu](/tpl/images/cats/istoriya.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/obshestvoznanie.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 12.07.2019 08:30
![Konu](/tpl/images/cats/obshestvoznanie.png)
![Konu](/tpl/images/cats/biologiya.png)
![Konu](/tpl/images/cats/obshestvoznanie.png)
![Konu](/tpl/images/cats/obshestvoznanie.png)
![Konu](/tpl/images/cats/istoriya.png)
History, 12.07.2019 08:30