E Test: Test 2

Test: Test 2 Question 10 of 14 possible This question: 1 point(s) possible Submit test Uranium-238 (U-238) has a half-life of 48 billion years. )Geologists find ai roCk containing a mixture of U:238 and lead, and determine that 80% of the original U-238 remains; the other 20% has decayed into lead. How old is the]rockQ The rock is billion years old. (Round to three decimal places as needed)