Which of the following have been used to measure wealth in early societies?

cows
dogs
grain
land
metals

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

How many kilometers are equal to 5 miles? use 1 mile ≈ 1.61 kilometers. !

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?