Mathew used his computer for 2 1/8 hours in Tuesday evening and for 2 1/4 hours in Wednesday evening. Which is the best estimate of the time Mathew used his computer on Tuesday and Wednesday evenings

About 4 hours. When you add the numbers together, you get

2 1/8 + 2 1/4 = 35/8 = 4 3/8 = 4.375

Step-by-step explanation:

Since the answer is not greater than 4.5, you round down to 4. If the answer was greater than 4.5, you would have rounded up to 5.

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:

44

step-by-step explanation: