Which action requires the use of the second function button on the Texas Instruments TI-30XIIS calculator? a. LOG b. MEMVAR c. RCL d. STO

The second function button on the Texas Instruments TI-30XIIS calculator is essential for accessing certain mathematical operations and features. Specifically, in this case, if you want to find the logarithm of a number, you would need to use the second function button alongside the LOG function. This enables you to perform advanced calculations that would otherwise not be directly available on the primary keypad. In the context of the options provided, the second function button doesn't apply to MEMVAR, RCL, or STO as these functions can be accessed without it. Understanding how to navigate the second function buttons can transform you from a casual calculator user into a math wizard ready to tackle any calculation!