That's not a good question at all. It's a lot like asking "What are the statements for News and President Obama ?"
There are at least a hundred formulas that are useful in trigonometry. One of the most useful is:
In a right triangle, the square of the length of the hypotenuse is equal to the sum of the squares of the two short sides.
Pythagoras is the name of the ancient Greek mathematician who discovered that formula. The formula is so useful that it's known by his name, in his honor.
12x minus -3x is the same as adding two positives. That gives us 15x. 4 - 5 is -1. Putting the two simplified parts of the expression together, we get 15x - 1. Mason is correct.
