Answer:
0.5
Step-by-step explanation:
0.42 x = 0.21
x=0.5
$ 5 is taken is off the regular price
<em><u>Solution:</u></em>
Given that, Regular price of the soccer ball is $ 25
During the sale, it is 20 percent off
Let "x" be the amount that is taken off the regular price
Regular price = $ 25
Discount = 20 percent off
Which means, 20 % of regular price is taken off
x = 20 % of regular price
x = 20 % of 25

Thus $ 5 is taken is off the regular price
I believe that it's (1,3)
(tip: with these problems, try to use desmos.com)