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.

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

gmt is 4 hrs ahead of edt so just add four hours to 1: 14: 20 (minutes and seconds stay the same)

gmt is 5: 14: 20

hope this !

~just a girl in love with shawn mendes