What is the basic economic problem that makes choices necessary ?

What is overdraft protection (odp)? a.) a cheap and easy way to always avoid overdrawing a bank account b.) a service to automatically transfer available funds from a linked account to cover purchases, prevent returned checks and declined items when you don’t have enough money in your checking account at the time of the transaction. c.) an insurance policy sold by banks to prevent others from withdrawing your money d.) a service provided by the government that insures individuals bank deposits up to $250,000

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.

One of the benefits of a well designed ergonomic work environment is low operating costs is true or false