A
rational number is any number that can be written as the
ratio between two other numbers i.e. in the form

Part A:
An easy choice that makes sense is 7.8, right in the middle. To prove that it's rational we need to write it as a ratio. In this case we have

Part B:
We need a number that can't be written as a ratio (because it neither terminates nor repeats). Some common ones are

,

,

and

so it makes sense to try and use those to build our number. In this case

works nicely.
The answer to that question is x=20
Answer:
12546
Step-by-step explanation:
9.5% = 0.95 = 95
12,640 - 95 = 12546
Answer:
28+12x
Step-by-step explanation:
Multiply 7 with 4
Multiply 3x with 4