Which of these tables represents a function

(note i put the graph in so plz )the graph shows the amount of water that remains in a barrel after it begins to leak. the variable x represents the number of days that have passed since the barrel was filled, and y represents the number of gallons of water that remain in the barrel. what is the slope of the line

Apackage of orgainc strwberries costs $1.50 while there in season and $2.25 when not in season what the percent increase

Fiona has to plot a histogram of the given data