Answer:
Step-by-step explanation:
alphabet to represent numbers.
Answer:
a) 
b) 
c) 
d) 
Step-by-step explanation:
a) The function of exponential growth for a population has the following formula:

In this equation:
is the initial population
r is the growth rate
t is the time in years
In this problem we know that

million in the year 2012.
So the equation is:

Where
represents the year 2012
b) If
in 2012, then in 2018 
The population in 2018 is:

c) To know when the population is equal to 10 million we must equal P(t) to 10 and solve for t.


d) The function is doubled when 

We solve for t.


Answer: $21.25
Step-by-step explanation:
0.85 x 25
IT is an rational number because a whole number is a number with no decimal part, an integer is a natural number with no decimal part that could be either negative or positive. Since the number does not have a decimal part, it is rational.