For an LP in standard form with constraints Ax = b and x ≥ 0, show that d is a direction of unboundedness if and only if Ad = 0 and d ≥ 0.

Determine which of the four levels of measurement (nominal, ordinal, interval, ratio) is most appropriate. monthly temperatures: 63 degrees upper f comma 67 degrees upper f comma 71 degrees upper f comma 75 degrees upper f comma and 79 degrees upper fmonthly temperatures: 63° f, 67° f, 71° f, 75° f, and 79° f