Missing information, you didn't provide the matrix
What are you confused by?
We can use two different methods to find our missing angle:
Subtract the two known angles from 180° :
Plug the two angles into the formula and use algebra: a + b + c = 180°
Tracey paid 34.5% of the original price.
<u><em>Explanation</em></u>
Tracey paid $190 for an item that was originally priced at $550.
For finding the percentage, first we need to <u>divide the paid amount by the original price and then multiply the result by 100%</u>
So, the percentage % % = 34.5% <em>(Rounded to the nearest tenth)</em>