The half-life of argon-44 is 12 minutes. Suppose you start with 20 atoms of argon-44 and wait 12 minutes. how many atoms of argon-44 will be left?

5 atoms
20 atoms
40 atoms
10 atoms

An example of environmentally learned behavior is aggressive behavior, i grew up seeing many aggressive people in my life and a slowly started picking up those traits however i was able to call myself out and not give in to those traits.

When is this

D.) a wheel barrow, due to the fact that where the weight is in the middle, the fulcrum is at the wheel, and the input force is at the other end