John drove 255 miles using 10 gallons of gas. At this rate, how many gallons of gas would he need to drive 411 miles?

What is the value of x when x + 7 = 21?

The tile along the edge of a triangular community pool needs to be replaced? ?

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