we have that for c=5 and n=20------------> n*c=20*5=100 for c=2.5 and n=40------------> n*c=40*2.5=100 for c=2 and n=50------------> n*c=50*2=100 for c=1.25 and n=80------------> n*c=80*1.25=100
therefore <span>the function that models the data is n*c=100 </span> the answer is nc=100