if 10 g of radioactive substance are presented initially three years later only 5 g remain, how much of the substance will Be present after 7 years

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

ian gone lie this got me confused

step-by-step explanation:

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step-by-step explanation: