Answer:
1st:

2nd:

3rd:

Step-by-step explanation:
Graph all of them and see which ones cross the x- axis at the same points.
I believe your answer should be 3.
S=(n/2)(A+t)
x2 x2
2S=n(A+t)
--- --------
n n
2S n(A+t)
---=---------
n n
2S
---=A+t
n
.....2S
A=----- -t
......n
7/8 .. *2 = 15/16
7/8 ...* 5 = 35/40
7/8 ...* 10 = 70/80
You can multiply the numerator and denominator by any number ( must be the same number), to result in an equivalent expression
1/100 percentages are just a fraction out of 100