Question

What is the sum?

7/2 + (-3/5)

1. 4/3
2. 29/10
3. -21/10
4. 41/10

Answer 1

\[\frac{a}{b}-\frac{c}{d}=\frac{ad-bc}{bd}\]
\[\frac{7}{2}-\frac{3}{5}=\frac{7\times 5-3\times 2}{2\times 5}\]
\[=\frac{35-6}{10}=...\]