Then when x=0 (when it was no years after 1960, that is, the year 1960), the corresponding value for y was .80. Then x=20 (when it was 20 years after 1960, that is, the year 1980), the corresponding value for y was .50 So the two values of x to input into the function are 0 and 20. The corresponding values of y are .8 and .5 respectively. Edwin