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A bank teller weighs a roll of nickles to ensure there are 40 in the roll. Write an inequality that BEST describes the allowance for an margin of error of .015 of an ounce in the total weight (W) of the roll. The weight of the wrapper is not part of the problem.
A) 7.0398<=W<=7.0698
B) .16137<=W<=.19137
C) W<=7.0698
D) 7.0398<=W
This is simple arithmetic. You don't say what part you need help with.
total weight = 40 x 0.17637 = 7.0548
upper limit = 7.0548 + 0.015 = 7.0698
lower limit = 7.0548 - 0.015 = 7.0398
7.0398 <= W <= 7.0698
Notice that we add a 0 to decimals less than 1 so the decimal point is not overlooked. Then we add spaces at certain points to improve readability.
You might be interested in coinflation.com where you can see the current values of coins as the metals prices change every day.
