A trash compactor can compress its contents to 0.350 times their original volume and 4 times denser than their original density. Neglecting the mass of air expelled, what factor is the old density of the rubbish

2.8

Explanation:

Using p = m/v; (old density)

p' = m/v (new density)

=m/0.350 V

p'/p = (m/0.350V)/(m/v) = 1/0.350 = 2.86

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

real, smaller and upside-down.   so the answer should be b.