1.Erve borrows money to buy a new PS5 for $400 at a simple interest rate of 5%. He writes the equation t = 400 + (0.5 x 400) to represent the amount of money he will need to pay back after one year. Is Erve’s equation correct? Explain your answer and determine how much money Erve will need to pay back after one year.

i really dont know

step-by-step explanation:

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)

step-by-step explanation: