Using the definition of a convex set, prove whether the following set is convex or not: s: ={(x, y)∈r2 : y≤x when x≥0 and y≥x when x< 0}

Aman steps out of a plane at a height of 4,000m above the ground falls 2,000m very quickly and then opens his parachute and slowly falls the remaining 2000m to the ground what height above the ground would be the best choice for a reference point

What term makes it inconsistent y=2x - 4

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes