Answer:
D
Step-by-step explanation:
Z is the only relation that does not pass the vertical line test, so Z is not a function.
Answer: D
Answer:
B
Step-by-step explanation:
trust me bro
Let plug the variable into the equation.


We can conclude that this is incorrect because

does NOT equal

The correct answer would be:

;

; or

or

All

of these are correct answers.
-5.25 -(-7.5) (Conversion to decimals cuz' it's easier for me to type)
-5.25 + 7.5 (Subtracting a negative is like Adding a Positive)
7.5 - 5.25 (Rearranging)
2.25 (Subtracting)
2 1/4 Final Answer.
To do it w/o converting to decimals, make sure the fractions have the same denominator.