Marcos purchases a top-up card for his pre-paid cell phone. His remaining balance, , can be modeled by the equation B = 35 - 0.35n , where is the number of minutes he's talked since purchasing the card.

y-1700=200(x+4)

step-by-step explanation:

200(x+4) is 200x + 800 she is saving 200 per week x is the weeks and the -1700 is. us that’s howmuch she already had

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:

id

step-by-step explanation:

idk

idk

i know the way

and

idk

final total: 63

step-by-step explanation:

60 times sales tax

60 times 0.05

3

60 + 3

63