The person who can prove this all question will get the brailiest award

This only has answer 1. these proofs are really long, so hard to fit them all in one answer.

Step-by-step explanation:

: Will be used very often so just remember this equality.

1. Multiply

When we factor out the terms, we are left with:

We then use the rule above and convert it to :

Step-by-step explanation:

Attached

the simplified form is

step-by-step explanation:

we want to simplify the expression,

let us change the middle bar to a normal division sign to obtain,

we multiply the first fraction by the reciprocal of the second fraction to obtain,

we factor to obtain,

we cancel the common factors to get,

we simplify to get,

the correct answer is b

just sum

10 + 10 = 20