Answer:
B 0 ≤x≤9
Step-by-step explanation:
The domain is the input values of the graph. In this graph it is the values that the time variable takes.
Time can take 0 seconds to 9 seconds
0 ≤x≤9
Answer:

Step-by-step explanation:
The period of the functions
,
,
or
can be calculated as

The period of the functions
or
can be calculated as

A. The period of the function
is

B. The period of the function
is

C. The period of the function
is

D. The period of the function
is

E. The period of the function
is

A fraction is a short way of writing a division, and when you
actually perform the division, you get the decimal.
Either of them can be written as the other one.
The answer is 106.5 by using sin(28) = 50/x