When would the velocity of a wave traveling in a medium change?
OA, only if a property of the wave changes
OB. only if a property of the medium changes
O c. if a property of both the wave and the medium changes
OD. never

Sorry i don’t know what to do

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

Perhaps seek some professional ? it isn't very asking some children who are just trying to find out answers to homework.also, it seems professional would actually be good to you. obviously it isn't going to magically fix your depression, but it'll do something. drugs, smoking weed, it won't do much, especially if your husband is against it. if you do it he'll dislike it. but talk to him, try and get him to listen to you, and figure everything out together, okay? there's a website- maybe it can offer some ?