book Maths Puzzle Numerical Ability

This is a bonus question for my algebra class, Is there a special name for x to the fourth power?

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book Other Question

A roof rises 8.5 ft over a horizontal distance of 16.07 ft. What is the slope of the roof to the nearest hundredth?

Thank You!!
solve:

(0.8)^n=e^2

i dont know what type of problem it is so i put logarithm