3) (1 11/16 - 3 7/8) * 4;

Convert mixed numbers to improper fractions: $$1 \frac{11}{16} = \frac{27}{16}$$ and $$3 \frac{7}{8} = \frac{31}{8}$$.
Find a common denominator for the fractions inside the parentheses: $$\frac{31}{8} = \frac{62}{16}$$.
Subtract the fractions: $$\frac{27}{16} - \frac{62}{16} = -\frac{35}{16}$$.
Multiply by 4: $$(-\frac{35}{16}) \times 4 = -\frac{35}{4}$$.
Convert back to a mixed number: $$-\frac{35}{4} = -8 \frac{3}{4}$$.