Geologists can eebimnte the age of rodk by their uraniam-23s oontent. The uranium is inoorperated in the rook as it havdens and then decays wath first onder kinetics and a half ite of 4.5 bilion year. A rock it found to contain 83.1% of the anount of uranium 238 that it contained whon it was formed. (The amoint that the rock contained ahen it was formed oan be deduced trom the presence of the decany products of U+23.). Part A How oks is the rock? Exprest the age in years to two significent figures