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Many printed airline tickets contain a 10-digit document number

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Question

Many printed airline tickets contain a 10-digit document number followed by a

check digit. The check digit is chosen to be the sum of the first 10 digits mod 7. Determine whether the given number is a valid document number.

8434649758 2

valid

invalid

 
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A survey of 1600 commuters in New York

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Question

A survey of 1600 commuters in New York

City showed that 1190 take the subway, 630 take the bus, and 170 do not take either the bus or the subway.

(a) How many commuters take both the bus and the subway?

______ commuters

(b) How many commuters take only the subway?

______ commuters

 
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Find the difference

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Question

Find the difference.7364eight − 613eight

 
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find the base x.

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Question

If 244x = 10201three, find the base x.

 
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