Chris's wages vary directly as the same time she works. if her wages for 20 hours are $150, what are her wages for 38 hours?

$285

Step-by-step explanation:

Since the wages vary directly with the time, then use a direct proportion.

$150 is to 20 hours as x is to 38 hours

150/20 = x/38

15/2 = x/38

2x = 15 * 38

x = 15 * 19

x = 285

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: