Afreight train travels 132 feet in 1 second. at this rate, how many miles will it travel in 1 hour?

Hello!

You know that the train travels 132 feet in 1 second, and now you want to know how many miles travels in one hour.

First, we know that 1 mile is equivalent to 5280 feets, and in one hour we have 60*60 = 3600 seconds.

then, knowing that the train travels 132 feets per second, in 3600 seconds it travels 3600s*132ft/s = 475200ft

and now we need to write this in miles, knowing that each mile has 5280 feet:

475200/5280 = 90 miles.

5y

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: