a) Estimate the value of \( \frac{72.4}{5} \)

To estimate \( \frac{72.4}{5} \), you can round 72.4 to a more manageable number. For instance, round 72.4 to 70. Now, divide 70 by 5. This gives you \( 70 \div 5 = 14 \). So, a good estimate for \( \frac{72.4}{5} \) is 14. If you want a more precise estimation, you could round 72.4 to 75, which would give \( 75 \div 5 = 15 \). Hence, your estimated value for \( \frac{72.4}{5} \) lies somewhere between 14 and 15!