Me 1-6 i've been having a hard time with these

1 - 6 = 5 because if you have 6 pears and take one and eat it you have 5 left right?

1. 16X^2 - 9 = 0 -> X^2 = 9/16. So, X = 3/4

2. r^2 = 25. -> r*r = 25. So, r = 5

3. 25m^2 -1 = 0 -> 25m^2 =1 -> m^2 = 1/25. So, m = 1/5

4. 25p^2 - 16 = 0 -> p^2 = 16/25. So, p = 4/5

5. 16x^2 = 25 -> x^2 =25/16. So, x = 5/4

6. 4x^2 - 9 = 0 -> x^2 = 9/4. So, x = 3/2

The answer to the question is d