Which of the following are the factors of t^4 -81

I have a lot of factors mentioned at the end of this explanation.

Step-by-step explanation:

is a difference of squares since we can write it as .

A difference of squares, , can be factored as .

We see another difference of squares in this factored form.

I'm speaking of .

This can be rewritten as .

Let's factor it now.

So .

Now can also be factored if you invite all complex  numbers into play.

You will need here.

Now it is a difference of squares and we can do as we have been doing with the other factors:

So the complete factored form of is:

.

So here are some things that you could say is a factor of :

(same as one before; just a rewrite)

 (same as one before; just a rewrite)

 (same as one before; just a rewrite)

 (same as one before; just a rewrite)

 (same as one before; just a rewrite)

 (same as one before; just a rewrite)

There are other ways to write some of these hopefully you can catch them on your own in your choice if they so occur.

14 ft 7 inches

step-by-step explanation:

since each model inch corresponds to 25 real inches, 7 model inches will correspond to

7×25" = 175"

at 12" per foot, that is 14 feet, 7 inches.

it would open into a square depending on the type of envelope i’m not sure about the second part