Melissa collected the data in the table. When x = 4, what is the residual?

–3
–1
1
3

Really need on these. i have no idea what to do

Alice is paying her bill at a restaurant. but tax on the cost of a male is 5%. she decides to leave a tip 20% of the cost of the meal plus the tax

The width of a piece of rectangular land is 5m shorter rhan 1/3 of its length .find the width of the land if the length is 60m,150m.