Answer:
one term is in this expression
Step-by-step explanation:
Answer:
a)
, b)
, c)
, d) 
Step-by-step explanation:
a) Let assume an initial mass m decaying at a constant rate k throughout time, the differential equation is:

b) The general solution is found after separating variables and integrating each sides:

Where
is the time constant and 
c) The time constant is:


The particular solution of the differential equation is:

d) The amount of radium after 300 years is:

Answer:
C.
Step-by-step explanation:
The range of a function is the complete set of all possible resulting values of the function
which is here just (3 , 9 , 12)
so the choice is C.
The answer is 54 feet because 15+15+12+12=54
Hope this Helps :D