Pioneers often traded items they had for items they needed from other pioneers. what was this system of exchanging goods called?

You want to paint your room yellow, so you get some samples at the paint store. when you hold the sample against your white wall, it looks different from the way it looks against the green curtain. a psychologist would attribute this to perceptual constancy. visual paradoxes. contrast effects. threshold differences.

Jack manufacturing company had beginning work in process inventory of $8,000. during the period, jack transferred $34,000 of raw materials to work in process. labor costs amounted to $41,000 and overhead amounted to $36,000. if the ending balance in work in process inventory was $12,000, what was the amount transferred to finished goods inventory?

Alarge tank is filled to capacity with 500 gallons of pure water. brine containing 2 pounds of salt per gallon is pumped into the tank at a rate of 5 gal/min. the well-mixed solution is pumped out at the same rate. find the number a(t) of pounds of salt in the tank at time t.