Please help me find what to plot for this (no decimals )

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)

Benjamin believes that ¼ % is equivalent to 25%. is he correct? why or why not?