How many solutions does this system have?
x + 2y = -1
2x + 4y = -2

Infinitely many solutions.

Step-by-step explanation:

x+2y=-1

2x+4y=-2

x=-1-2y

2(-1-2y)+4y=-2

-2-4y+4y=-2

-2+0=-2

-2=-2

infinitely many solutions

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:

at home andrea has 1 2/3 kilograms of rice

step-by-step explanation: