If 10g of a radioactive substance are present initially and 3 years later only 5 g remain, how much of the substance will be present in 5 years

The mass of the substance that will remain after 5 years is 3.15 g

Step-by-step explanation:

Given;

initial mass of the radioactive substance, a = 10 g

remaining mass after 3 years, y = 5g

Generating a half-life equation;

After 5 years, the mass of the substance that will be present is given by;

y = 10(0.7937)⁵

y = 3.15 g

Therefore, the mass of the substance that will remain after 5 years is 3.15 g

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

kbmflmklbhml; bmlzb; bdhzz

step-by-step explanation: