Which expression is equivalent to −16y+13 ?

16(−y+2)
−16(−y+13)
−16(y+2)
16(−y+13)
25

None of them

Step-by-step explanation:

-16 y+13

16(−y+2)  = -16 +32

−16(−y+13) = 16y -208

−16(y+2)  = -16y -32

16(−y+13)= -16y+208

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: