How old are the cave paintings?

Question

Prehistoric cave paintings were discovered in a cave in France. The paint contained

37 % of the original​ carbon-14. Use the exponential decay model for​ carbon-14,

Upper A equals Upper A 0 e Superscript negative 0.000121 tA=A0e−0.000121t​,

to estimate the age of the paintings.

Answer 1

0.37 = e^-0.000121t

ln 0.37 = -0.000121t

-0.99425 ≈ -0.000121t

8,216.96 ≈ t