a) \( \frac{5}{12}-\frac{2}{9} \)

To subtract these fractions, we need a common denominator. The least common multiple of 12 and 9 is 36. Now, convert \( \frac{5}{12} \) to have a denominator of 36: \( \frac{5 \times 3}{12 \times 3} = \frac{15}{36} \). Next, convert \( \frac{2}{9} \) to also have a denominator of 36: \( \frac{2 \times 4}{9 \times 4} = \frac{8}{36} \). Now we subtract: \( \frac{15}{36} - \frac{8}{36} = \frac{7}{36} \). So, \( \frac{5}{12} - \frac{2}{9} = \frac{7}{36} \). Keep it up, mathematician! You're adding up some great skills. Subtracting fractions might seem tricky at first, but with practice, you'll handle them like a pro. Remember to always find that common denominator – it's the key to unlocking fraction subtraction!