Simplify the following fractions: c) 2/12 + 3/4, d) 9/8 + 12/9, e) 3/4 + 5/6 + 2/4

The least common multiple is 15.

$$\frac{2}{5} + \frac{4}{3} = \frac{2 \times 3}{5 \times 3} + \frac{4 \times 5}{3 \times 5}$$

$$= 1\frac{11}{15}$$

The final answer is $\boxed{\text{1}\frac{11}{15}}$.

B)

The least common multiple is 14.

$$\frac{9}{2} + \frac{6}{7} = \frac{9 \times 7}{2 \times 7} + \frac{6 \times 2}{7 \times 2}$$

$$= 5\frac{5}{14}$$

The final answer is $\boxed{\text{5}\frac{5}{14}}$.

C)

The least common multiple is 12.

$$\frac{8}{12} + \frac{3}{4} = \frac{8}{12} + \frac{3 \times 3}{4 \times 3}$$

$$= 1\frac{5}{12}$$

The final answer is $\boxed{\text{1}\frac{5}{12}}$.

D)

The least common multiple is 72.

$$\frac{9}{8} + \frac{12}{9} = \frac{9 \times 9}{8 \times 9} + \frac{12 \times 8}{9 \times 8}$$

$$= 2\frac{33 \div 3}{72 \div 3} = 2\frac{11}{24}$$

The final answer is $\boxed{\text{2}\frac{11}{24}}$.

E)

The least common multiple is 12.

$$\frac{3}{4} + \frac{5}{2} + \frac{4}{6} = \frac{3 \times 3}{4 \times 3} + \frac{5 \times 6}{2 \times 6} + \frac{4 \times 2}{6 \times 2}$$

$$= 3\frac{11}{12}$$

The final answer is $\boxed{\text{3}\frac{11}{12}}$.