Answer:
Following are the solution to this question:
Step-by-step explanation:
Using formula:

In question (1):

In point a:

In point b:


In question (2):

In point a:

In point b:


The 3 question is incomplete, that's why it can't be solved.
See the attachment below.
Hope it helps!
Answer: -4.5
Step-by-step explanation:
Answer:
It is the 3rd one.
Step-by-step explanation: