How old is a radioactive specimen if the half-life is 5,000 years and only 12.5% of the original material is remaining? 20,000 years 15,000 years 10,000 years 5,000 years

they are playing too much beyblade in the office

explanation:

found in the nucleus

has mass of one amu

i had this question and the answer was 3.15 miles.

martina travels from school to her mom's office. from there, she walks to school. after school, she walks to the library and then to a friends house before finally ending back at home. find martina's total distance traveled.

a) 0 miles  

b) 0.4 miles  

c) 1 mile  

d) 3.15 miles