Apainter takes 2 3/5 hours to paint a wall. how many hours will the painter take to paint 8 walls if she works at the same rate?

 hours

Step-by-step explanation:

If 1 wall takes    hours to paint,

8 walls would take    hours to paint [given same rate].

Changing    into improper fraction [for ease of multiplying]:

Now multiplying    with 8 gives us:

 hours

In decimal it is  hours

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:

x is greater than 5

step-by-step explanation:

2x+7 is greater than 17

    -7                           -7

2x is greater than 10

divide by 2 each side

x is greater than 5