Respuesta :

kimberlyvt19

Answer: 1.251 billion years

Explanation: The half-life of potassium 40 is 1.251*10^9 years. Since in the igneous rock there is one half of potassium left it means only one half-life has passed.

kmarthel05
Answer: the rock will
be 1.251 billion years old.

Hope this helps! ^^