The mountain bike cost $189 after both discounts
Answer:

Step-by-step explanation:
Let the two numbers be x and y
So we have:

using the elimination method, add the two equations together:

solve for x:

substitute our value for x back into the first equation we made:

therefore,

You have 28 meters of fence to make 3 sides.
28/3 = 9.3333
The pen will be 9.3333 by 9.3333 meters
Answer:
I need more information, meaning his formula.
Step-by-step explanation:
(4x - 4) - 3 simplified = 4x -7