The half life of pb-210 is 22 years. a decayed animal shows 25% of the original pb-210 remains; how long has the animal been deceased to the nearest tenth of a year?

44 years.

Step-by-step explanation:

Let original amount be 100.

We have been given that the half life of Pb-210 is 22 years. A decayed animal shows 25% of the original Pb-210 remains.

We will use half-life formula to solve our given problem.

, where,

A = Amount after t units of time,

a = Initial amount,

t = Time,

h = Half-life.

Take natural log of both sides:

Using natural log property , we will get:

Therefore, the animal has been deceased to 44 years.

22 and 22

step-by-step explanation:

10 plus 12 equals 22.

12 plus 10 also equals 22 because regardless of what order they're in, they're gonna equal the same thing.

b

step-by-step explanation:

it have 5 sides and 5 identicle angle.the rest does not have the same property as b.

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