What fact or facts support a situation where trade is advantageous? i only ii only i, ii, and iii iv only i, ii, iii, and iv(pick more than 1)

Luc do purchased stocks for $6,000. he paid $4,000 in cash and borrowed $2,000 from the brokerage firm. he bought 100 shares at $60.00 per share ($6,000 total). the loan has an annual interest rate of 8 percent. six months later, luc do sold the stock for $65 per share. he paid a commission of $120 and repaid the loan. his net profit was how much? pls

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.

According to ceo heidi ganahl, camp bow wow requires a strong and consistent corporate culture to keep all local franchise owners "on the same page" and to follow a common template for the business and brand. this culture could become detrimental over time because: (a) strong consistent cultures are inflexible and incapable of adapting to environmental change (b) strong consistent cultures are too flexible and capable of adapting to environmental change (c) strong consistent cultures don’t perform well in any environment (d) the passing of time provides stability and predictability for businesses