40 pts + brainliest 1. describe a rule that will work for finding the sum of any two rational numbers. 2. describe a rule that will work for finding the difference of any two rational numbers. 3. describe a rule that will allow the sum of two rational numbers to always equal zero. 4. describe a rule that will allow the product of two rational numbers to always equal one.

1.

rational numbers are numbers that can be written in form a/b where a and b are integers (-4,-3,-2,-1,0,1,2,3, etc) and b isn't 0

so for case

we need to make the denomenators the same

so for , multiply left one by d/d and multiply right one by b/b to get

therefore [/tex] is the rule

2. do the same as previous but do minus

so for case

we need to make the denomenators the same

so for , multiply left one by d/d and multiply right one by b/b to get

therefore [/tex] is the rule

3. not sure, I hope this is right

so for case

we need to make the denomenators the same

so for , multiply left one by d/d and multiply right one by b/b to get

if we multiply both sides by bd we get

ad+cb=0

therefore, ad=-cb for the sum to always equal 0

4.  

multiply both sides by bd

ac=bd for the product of the 2 fractions to equal 1

Step-by-step explanation:

Average speed = distance/time

Distance is:

Time is

Av. speed