[s3a]

Can someone tell me whether each of the four equations are endothermic or exothermic as well as why? (The answer is A.)

Any help would be greatly appreciated!
Thanks in advance!

[s3a]

Oops! Wrong picture uploaded!

[Borek]

Your work?

[typhoon2028]

It is very hard to read your picture.  Do you understand how to read the energy diagrams?

I would try to think about rolling a ball up hill or down hill.
Examples would be: 

1.)  For a reaction to take place the ball must be rolled up hill.  To roll the ball up hill you must keep adding energy to the ball.  What kind of reaction does this represent

2.)  For a reaction to take place the ball must be rolled down hill.  The ball will roll down hill without any help from you, but if you wanted to stop or slow the ball you would have to remove energy from the ball.  What kind of reaction releases energy?