You had $21 to spend on three gel pens. After buying the pens you had $12 left over. How
much did each gel pen cost? Create an equation and solve. (Show all your work and thinking,
I will mark this myself). *
(4 Points)

$3

Step-by-step explanation:

$21 - $12 = 9

9 / 3= 3

Answer is $3 each pen

Each pen cost 3 dollars

Step-by-step explanation:

12 plus 9 is 21 which is how much you had. if you need 3 pens and you spent 9 dollars each pen costs 3 dollars because 9 divided by 3 is 3.

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.

square root

step-by-step explanation: