Find the missing value for the radioactive isotope. (round your answer to two decimal places.)

isotope: 14c

half-life (in years): 5715

amount after 1000 years: 1 g

find the initial quantity

explain answers. i don't understand how to solve this.

1.1289 grams ( approx )

Step-by-step explanation:

Since, the final quantity of an element which has half life of n periods,

Where,

P = initial quantity,

t = total number of periods,

Here, A = 1 gram, t = 1000 years, n = 5715 years,

By substituting the values,

( using calculator )

Hence, the initial quantity would be 1.1289 grams ( approx )

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!

312312

step-by-step explanation: