How do i know my friends are good or bad

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !

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

What is the gcf of 20c^3-5c^4+30c^6