Radium–226 has a half life of 1,600 years. If we start with 8,000 atoms of radium, how much would remain after 3,200 years? PLEASE NEED ANSWER ASAP!

Much of the information taught in earth-space science would not be available if it weren’t for our remote sensing abilities. explain two ways our remote sensing strategies contribute to our knowledge of these topics.

How does an observation about an object differ from an inference about that object

Using proper grammar, spelling, and punctuation, write at least one 5 sentence paragraph describing 3 ways we use the elements of the electromagnetic spectrum (ems) in our everyday lives.