Y=1.9x+2.5 what does this equal

Ijust need to see how to do this. so you don’t have to answer all of them just a step by step explanation of one.

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x