Mrs. Rivera's class has been keeping track of their recycling for the past four
weeks. During the first week of the school year, they only managed to recycle 4
pound of paper. On week two, theyrecycled 8 pounds of paper. On week three,
they recycled 12 pounds of paper. Finally, on week 4 they recycled 16 pounds of
paper. If this pattern continues, how much will they recycle on week 6?