I believe it's increasing on all fronts, because if you start from the right, you see that the y values always increase, hence they are increasing. They do it for when x<0 and when x>0. So, it should be increasing on all real numbers
Everything you need is in the picture attached.
Remember that when you find 30% of the number you have to subtract the 30% from your original $90 because it is 30% off the original price.
What do you mean? I don't think it's enough information