Salutations!
To find the nth term, you will be needing a formula.

a stands for the first term (first number in the sequence)
d stands for the difference between two terms. (always remember to subtract from the 2nd term to the 1st term)
and the n is what we are going to find
so in your sequence: 5, 10, 15, 20
5 is a (as it is the first term)
d would be 5 ( 10 -5 =5)




your nth term is

Hope this helps!
Have a great day!
I believe the correct option is C.
Fractions can be simplified by making sure that the numerator and the denominator cannot be divided by any number.
The given 12/60 is very obvious that it is divisible by 2.
After dividing by 2, you will get 6/30.
It seems it is not in simplest form. It is divisible by 3.
Dividing the numerator and denominator by 3 then you will get
2/15.
So the lowest term is 2/15.
log(x+3)(2x+3)+log( x+3)( x+5) =2
logx(2x+3)+3(2x+3 )+log x(x+5)+3(x+5)

No negative and a negative cancels out