Please help quick! The average cost of printing a book in a publishing company is c(x)= (5.5x+k)/x , where x is the number of books printed that day and k is a constant. Find k, if on the day when 200 were printed the average cost was $9 per book.

700

Step-by-step explanation:

c(x)= (5.5x+k)/x

x = 200, c(x) = 9

9 = [5.5(200) + k]/200

1800 = 1100 + k

k = 700

k = 700

Step-by-step explanation:

c(x)= (5.5x+k)/x

We know c(x) is 9  and x is 200

Substitute these values into the equation

9 =  (5.5*200+k)/200

Multiply each side by 200

9*200 = (5.5*200+k)/200 *200

1800 = (5.5*200+k)

1800 =1100 + k

Subtract 1100 from each side

1800-100 = 1100+k-1100

700 =k

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:

mark other person brainliest