Assuming that an exponentiation sign is missing, all you need to know is that rational exponents work like this:
So, you have
And similarly,
Answer:
I think the answer is 0.2683281573
If two non-vertical lines are perpendicular, then their slopes are opposite reciprocals giving you -1.
:) Hope this helps.
With some extra effort, the radical can be removed from the denominator. That result is
The preferred form would be the one with the radical in the denominator, as it correctly shows the domain of the function to be x ≥ -7. The function actually is defined at x=74, which the "rationalized" form does not show.