-1/2(6x+10)=13 please help I’m a lil confused on it

Desmond wants to sell his car that he paid $8,000 for 2 years ago. the car depreciated, or decreased in value, at a constant rate each month over a 2-year period. if x represents the monthly depreciation amount, which expression shows how much desmond can sell his car for today? 8,000 + 24x 8,000 − 24x 8,000 + 2x 8,000 − 2x

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827