Asample of radium-226 will decay to ¼ of its original amount after 3200 years. what is the half-life of radium-226?

years?

Blank liquids and gases exert a buoyant force on objects placed in them

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

Alandscaper is shopping for landscaping materials. she wants to use materials through which water flows easily. which materials should she choose? check all that apply. clay gravel granite rocks with cracks loosely packed soil