Log base 16 of 256 -log base 16 of 16

(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

What term makes it inconsistent y=2x - 4 ?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36