Sahrye has brought in an assortment of shoes to determine which work better for her in pumping the Inflation Lab's pedals. She begins with a pair of black ballet flats, then tries an unusual pair of see-through high-heel pumps. She then tries a pair of tan flat-heeled thong sandals, a pair of brown high-heel sandals, a pair of nearly flat-heeled flip-flips, and finally, a pink pair of flat-heeled thong sandals. Which do you think work better?

Sahrye has brought in an assortment of shoes to determine which work better for her in pumping the Inflation Lab's pedals. She begins with a pair of black ballet flats, then tries an unusual pair of see-through high-heel pumps. She then tries a pair of tan flat-heeled thong sandals, a pair of brown high-heel sandals, a pair of nearly flat-heeled flip-flips, and finally, a pink pair of flat-heeled thong sandals. Which do you think work better?