[tex] - \frac{5}{16} \times \frac{4}{7} - \frac{21}{32} \div ( - \frac{9}{4})[/tex]

1) -5/16 * 4/7 = -5/4 * 1/7 = -5/282) 21/32 * (-4/9) = 7/8* ( - 1/3) = -7/243) -5/28 + 7/24 = -5*24+7*28 /672 = -120+196/672 = 76/672 = 19/168