For 20 points, 5 stars, and a thanks, can some one answer these 5 questions about percent increase and decrease? 19. 380;5% increase
20. 39; 33% decrease
21. 48; 15% increase
22. 3,000; 325% increase
23. 160; 20% decrease

380; 5% increase is 399

39; 33% decrease 26.13

48; 15% increase 55.2

3,000; 325% increase 12,750

160; 20% decrease 128

Step-by-step explanation:

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:

1.0

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