I think is A and the another question is B
Answer: not sure what you were trying to ask but two less than 15 is 13.
Answer:


Step-by-step explanation:



The interval notation will be:

The contrary,

is 
Answer:
oh, you may have forgotten to add the file, you can edit and add it, which i will edit my response and respond.
Step-by-step explanation:
this picture has bad quality, please resend with better picture so i can answer all of them