HW Score: 92
Subject:MathPrice: Bought3
HW Score: 92.86%, 13 of 14 pts X 9.C.43 # Question Help A certain element has a half life of 2.5 billion years. a. You find a rock containing a mixture of the element and lead. You determine that 20% of the original element remains; the other 80% decayed into lead. How old is the rock? b. Analysis of another rock shows that it contains 65% of its original element; the other 35% decayed into lead. How old is the rock? a. The rock is approximately billion years old. (Round to one decimal place as needed.) Enter your answer in the answer box and then click Check Answer. ? 1 part remaining Clear All Check Answer Type here to search O 16 W 11:46 PM 7/31/2020
