Help this is algebra 10 :((

Girardo is using the model below to solve the equation . girardo uses the following steps: step 1 add 4 negative x-tiles to both sides step 2 add 1 negative unit tile to both sides step 3 the solution is which step could be adjusted so that gerardo's final step results in a positive x-value? in step 1, he should have added 4 positive x-tiles to both sides. in step 1, he should have added 3 negative x-tiles to both sides. in step 2, he should have added 4 negative unit tiles to both sides. in step 2, he should have added 1 positive unit tile to both sides.

The price of a car has been reduced from $19,000 to $11,590. what is the percentage decrease of the price of the car?

Cos^2x+cos^2(120°+x)+cos^2(120°-x)i need this asap. pls me