The perimeter of a rectangle is 30 inches if its length is three times it’s width find the dimensions

Length = 45/4 inches

Width= 15/4 inches

Step-by-step explanation:

Perimeter= 30 inches

Let width = x

Length = 3x

Perimeter = 2l + 2w

30= 2(3x) + 2(x)

30 = 2(3x+x)

30/2 = 3x+x

15 = 4x

x= 15/4

Hence width is 15/4

Then the length must be 3x = 3(15/4)

THEREFORE, Length = 45/4 inches

Width= 15/4 inches

Hope this helps!

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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: