Questions

A credit card's interest rate is the price you pay for borrowing money. For credit cards, the interest rates are typically stated as a yearly rate. This is called the annual percentage rate (APR). On most cards, you can avoid paying interest on purchases if you pay your balance in full each month by the due date.

Your APR is expressed in terms of a year, but credit card companies use it to calculate charges over your monthly statement period.

Footsteps. 

Yes, as you walk forward, you will leave the footstep behind you.

The side view mirror, in all the vehicles we use only convex mirror. This mirror makes the objects and small to show them in the mirror. That's why in all such mirrors, "Ojects in the mirror are closer than they appear."

Cholesterol is referred as an amphipathic molecule, that it contains its hydrophilic and hydrophobic parts.

Distributed systems work in a network. They can share the network resources,communicate with each other.