129 degrees is the correct answer for the missing angle number 1 :)
The dollar amount of the discount is 440 - 154 = $286.
Therefore the percentage discount for the sale is given by:
4x = 7(x-3)
1. Distribute that multiplicand 7: 4x = 7x - 21
2. Group the x terms together: Subtract 4x from both sides: 0 = 3x - 21
3. Solve for x: Add 21 to both sides: 21 = 3x
4. Divide both sides by 3 to obtain x = 7 (answer)
Y = 10
-4 * 10 = 40
Hope this helps!!!:):):)