Pi is an irrational number because it doesn't end.
Pi is an irrational number
Pi (π) is an irrational number, meaning it represents a real number with a non-repeating pattern that can't fully be expressed. Although Pi has an unrepresentable number of digits in its decimal representation, it can be approximated as 3.14159. FACT: Pi represents the ratio of a circle's circumference to its diameter
answer: a and c are correct
the +5 is the vertical translation
the added negative symbol in front is the reflection over the y-axis
since your problem is x^4 = 81, what you have to undeo is the "to the fourth power" part.
the inverse (opposite operation) of "to the fourth power" is "to the fourth root".
(x^4) ^ ¼ = 81 ^ ¼
81 = 3^4 so (3 ^ 4) ^ ¼ = 3 ^ 1 = 3
by hand: (3 ^ 4) ^ ¼ = 3 ^ (4 x ¼) = 3 ^ 1 = 3 (when you take a power to a power, multiply the exponents.)
or, do it by calculator. one way of finding the fourth root is to use ^ (1/4)