1. An improper fraction is just an unsimplified fraction, so -9 ÷ -4 = [tex] \frac{9}{4} [/tex]
2. As for this one, 3.8 divided by -4 is -0.95. This answer as a fraction is [tex] \frac{95}{100} [/tex] , but simplified would be [tex] \frac{19}{20} [/tex]