Carbon-14 has a half-life of 5,730 years. It is used in "carbon dating" to determine the age of once living organisms. How much of a 144 gram sample of C-14 will remain after 17,190 years have past.

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

pie chart because it is in percents ( % )

what is the question here. i think you messed up.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.