Problem says: A triangle has two acute angles. One angle is 25 degrees, so what is the other acute angle?

--I'm not sure what to do here.....would I just subtract 25 from 90?

Also, how would I figure out if it is possible to have a triangle with sides 5, 7, and 12?

--I think it's possible but I'm not sure if I'm correct...I just added 5 & 7 and got 12...so that means the side with length of 12 would connect between sides of 5 & 7.