Answer:
The first one is the only one in simplest form.
Answer:
Because 20 has to be doubled to become 40. While 40 is twice as much as 20 so you just divide 40 by 20 to get 50%.
Explanation:
20 x 20 = 40 = 100%
40 / 20 = 50%
Assuming that the 1/2 is to be distributed; slope would be x or 1 and the y intercept would be -4
