3 Two mobile phone companies have different tariffs for text messages: Phone company X charges $20 per month for unlimited texts. .
Phone company Y charges $5 per month and $0.05 per text. .
a) For each company, write a formula that gives the total monthly charge
($C) for someone who sends n texts.
b) Draw a graph of C against n for both companies on the same axes,
showing the monthly charges for up to 500 texts.
c) From your graph estimate the number of texts at which both companies
would have the same monthly charge.

a) company x formula---> C = 20

company y formula ----> C = 0.05n + 5

b) graph attached

c) 20 = 0.05 n + 5

15 = 0.05n

n = 300 messages and they will have the same monthly charges

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:

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76