Question

Which exponential is equivalent to the logarithmic equation below? log 987 = a

Answer 1

A logarithmic function without a subscript means that it must be log base 10.

$\log_{10}987=a$

When learning about logarithms, a textbook/teacher provides their students with the following general equations

$\log_yx=z$

$y^z=x$

Hopefully you are familiar with this. Using the equations that I just showed, we can change the equation $\log_{10}987=a$ to $10^a=987$

This would make answer choice C correct.