Exponential decay is a very common process especially when we are talking about radioactive materials. So, there is already a common formula for this type of behavior which is written below:
A = Pe^-rt where A is the amount left after time t P is the initial amount at t=0 r is the rate
Substituting the values, A = (780 g)(e^-0.163*16) A = 57.5 g
it's congruent because the sides of the triangles are equivalent lengths, as shown with the red lines, yuhp. congruent shapes have the same shape and size
