f(3) = 1.9
Solution:
Given function:

To find f(3):
Substitute x = 3 in the given function.


Let us first simplify
.
Apply exponent rule: 

The value of
. (using calculator)


Substitute this value in f(3).


f(3) = 1.9
Hence the value of f(3) is 1.9.
Answer:
b
Step-by-step explanation:
It could tell you that your amount sold is going up steadily per unit of time
Graphs can be used to represent functions.
See attachment for the graphs of: <em>y =x - 2, y = 0.4x - 2, y =-x - 2</em>
The function is given as: 
When k = 1,
We have:
----- substitution property of equations

So, the equation is:
when k = 1
When k = 0.4,
We have:
----- substitution property of equations

So, the equation is:
when k = 0.4
When k = -1,
We have:
----- substitution property of equations

So, the equation is:
when k = -1
See attachment for the graphs of:
,
and 
Read more about graphs and functions at:
brainly.com/question/11804653
82.693
the rule is when its 4 and under round down and 5 and up round up