an anthropologist finds there is so little carbon-14 remaining in a prehistoric bone that instruments cannot measure it. this means there is less then 0.2% of the amount of carbon-14 the bones would have contained when the person was alive. how long ago did the person die? ( the constant for carbon-14 is 0.00012)

Afamily has two cars. the first car has a fuel efficiency of 25 miles per gallon of gas and the second has a fuel efficiency of 15 miles per gallon of gas. during one particular week, the two cars went a combined total of 1025 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?