Answer:
the domain of the function is all real numbers less than or equal to 0
Answer: (f)
Step-by-step explanation:
Given
Line that passes through
and 
Using two point form, equation of a line is given by

Insert the values

Thus, option (f) is correct
Answer: $4.50
Step-by-step explanation: If it is 50% off then you take the price of $2.25 and double it. So 2 times $2.25 which is $4.50.