Question 563190
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For this problem, you will need to go to the US Mint website, which is:

http://www.usmint.gov/about_the_mint/?action=coin_specifications
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a. a pound of pennies or a 6 inch stack of quarters?
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Find the weight of a penny in grams from that website.

Use the fact that 1 Pound = 453.59237 grams to determine how many
pennies are in 1 pound.

Determine how much money this is

Find the thickness of a quarter in millimeters from the website
Use the fact that 1 inch = 25.4 mm to deterine how many quarters
are in 6 inches. 

Determine how many quarters are in a 6 inch stack.

Determine how much money this is.

Compare the two. 
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b. a 3 inch stack of quarters or a yard of nickels end to end?
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You will already have found the value of a 6 inch stack of quarters,
so a 3 inch stack will be just half as valuable.

The nickels are not stacked as the quarters are, butplaced end to end, 
so you will need the diameter of a nickel.

Find the diameter of a nickel as the decimal part of an inch from the website

Use the fact that 1 yard = 36 inches to determine how many nickels are in a
yard when placed end to end.  

Determine the value of that many nickels.

Compare those values.
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c. 4 dollars or 4 pounds of pennies. 
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In part a you have already found the value of 1 pound of pennies.
Just multiply it by 4 and see if this is more or less than $4.

Edwin</pre>