TessanneD188900 TessanneD188900

30-10-2022
Mathematics

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14 g of a radioactive substance are present initially and 4 yr later only 7 g remain, how much of the substance will be present after 7 yr?

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TamraJ646472 TamraJ646472

30-10-2022

The annual ratio of decrease of the substance is

[tex]\frac{7g}{4yr}[/tex]

After 7 years the substance will decrease:

[tex]\frac{7\text{ g}}{4yr}\cdot7yr=\frac{49\text{ g}}{4}=12.25g[/tex]

The amount of substance after 7 years must be 1.75 g

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