3. The number of words learned in a foreign language class is given by N{r1=15r r\" words where t is the number of hours studied, 5 it 5 5 it. Use a numerical approach to estimate N' (3.5). Show your chart. I}. Give the results of part a in a sentence of practical interpretation. c. Find the percentage rate of change of NE) at r = 3.5. Give units with your