Aradioactive substance has a decay rate of 0.073 per minute. how many grams of a 120 gram sample will remain radioactive after 30 minutes? round the answer to the nearest tenth of a gram, and do not include the unit in your answer.

13.4 grams of a 120 gram sample will remain radioactive after 30 minutes.

Step-by-step explanation:

Given : A radioactive substance has a decay rate of 0.073 per minute.

To find : How many grams of a 120 gram sample will remain radioactive after 30 minutes?          

Solution :

Using decaying formula,  

Where, is the initial amount

r=0.073 is the decay rate

t=30 minute is the time

Substitute the value in the formula,

Therefore, 13.4 grams of a 120 gram sample will remain radioactive after 30 minutes.

i only know the sequence of arithmetic it adds the first is 5+4 then it goes up as it adds to then it is 9+5 then 14+6 then to 20+7 and so on. 5,9,14,20,27,35.

step-by-step explanation: