Use the X method to find the solutions of
62 + 2x - 20 = 0.
X
x

x = -21

Step-by-step explanation:

62 + 2x - 20 = 0

2x = -62 + 20

x = -42 / 2 = -21

a)33.33333333%  b) 25%

Step-by-step explanation:

a) To find you're answer, you need to find the equivalent percentage to the fraction 4/12.  SO you need to do 4 divided by 12, or you can find an equivalent fraction. 4/12=1/3 and 1/3 is 33.33333%

b) The total number of fish is 4+12=16.  4/16= 1/4 and 1/4 is 25%

I really hope this answer helps!