First we check whether
is equivalent to 
= 
Both top and bottom are multiplied by 2 to get 
So they are equivalent fractions.
Now we check whether
is equivalent to 
= 
Both top and bottom are multiplied by 10 to get 
So they are equivalent fractions.
=
=
Hence we conclude that they are equivalent fractions.
Answer:
The correct order of fractions in descending order will be:

Step-by-step explanation:
Given fraction:

To arrange them in descending order.
Solution:
In order to arrange the fractions in descending order, we will have to find the least common denominators.
To find the least common denominator, we will find the least common multiple of the denominators 3,5, and 30.
Since 30 is a common multiple of all 3 numbers, so it will be the least common denominator.
So, we multiply the numerators and denominators with same numbers in order to make the denominators = 30.
So, we have:

⇒ 
⇒ 
Now, we compare the numerators and arrange them accordingly.

So, the correct order of fractions in descending order will be:

Is 6/2(2+1) 1 or 9? I will tell you why it should be one:
6/2a = 3/a. Let a = 2+1.
The student messed up on step one. The proper factoring is (x-4) (x+2)