The expression in the image asks to calculate $\log 72$.

If this is a logarithm with base 10 (common logarithm), we can calculate it using a calculator:

$\log_{10} 72 \approx 1.8573$

So,

$\log 72 \approx 1.8573$

Would you like more details on how logarithms are calculated or any related concepts?

Here are 5 questions to deepen your understanding:

1. What is the difference between natural logarithms and common logarithms?
2. How does the change of base formula work for logarithms?
3. What are the properties of logarithms, such as the product, quotient, and power rules?
4. How can you use logarithms to solve exponential equations?
5. How is the logarithmic scale used in real-life applications, like measuring sound or earthquakes?

Tip: When solving logarithmic problems, ensure you know the base of the logarithm (common or natural) to apply the correct method for solving!