Me
if we know that the total area of the united states is 9,826,675 sq km and they have 18.01% of arable farmland, how many square km of arable farmland does the united states have?
show steps also on how you got your answer if it is correct

False is the answer    hope to soon

Psychologists often talk of the magical number "7" - so it is generally assumed that we can keep 7 (more or less, so 5-9 is the correct answer) items in our short term memory - we know this as a result of many experiments.

we can increase this by chunking, so for example "7 8 9 5 3" is harder to remember than "78 95 3" - try it yourself!

the answer is a)