Acertain sample of a radioactive material decays at a rate of 213 per second at t = 0. at t =20 minutes, the counting rate has fallen to 123per second. (a)what is the half-life of the sample? (b)what is its decay constant? (c)what will be the decay rate at t =105 minutes?

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

it would be c. predictability