A13 and one fourth inch board is cut from a 38 and three fourths inch board. the saw cut takes three eighths inch. how much of the 38 and three fourths inch board is left after cutting?

There is 25 1/8 inches left

Step-by-step explanation:

We have a board that is 38 3/4 inches

We cut away 13 1/4

38 3/4

-13 1/4

25 2/4

The saw takes 3/8

25 2/4

-    3/8

Get a common denominator of 8   2/4 * 2/2 = 4/8

25 4/8

-    3/8

25 1/8

There is 25 1/8 inches left

Step-by-step explanation:

A 13 and one fourth inch board is cut and the saw cut takes three eighths inch. So total length from cut = 13 1/4 + 3/8 = 13 5/8 inch.

Original board is 38 and three fourths inch.

So after cutting, there is 38 3/4 - 13 5/8 = 25 1/8 inch left in the original board.

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: