A rectangle has a width of 8 inches and a perimeter of 70 inches. What is the length of the rectangle

27 in

Step-by-step explanation:

w = 8

2 (l + w) = 70 in

2( l + 8) = 70 in

2l + 16 = 70

2l = 70 - 16

2l = 54

l = 54/2

l = 27

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: