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

not sure but it may be b, as i said i'm not sure.