Question

Approximately what is d when the value of f(d) = 400,000?

Answer 1

I could be wrong, but if a function says f(x)=#, than the domain (the x values) range from negative infinity to infinity, where for every x value, the y value is always #, so in this case, the value of d (or x) would be negative infinity to infinity, written as a domain, surrounded by parentheses.

Explanation: