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telo118 [61]
3 years ago
7

Christine is planning to install a device that can provide information on the route her child takes from home to school and back

. Which device should she install?
CCTV
GPS
automobile safety systems
computer programs with voice recognition system
internet-filtering software
Geography
1 answer:
Zarrin [17]3 years ago
3 0
GPS, the only one that gives directions
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Set this up as

10 = 40 (1/2)t/28

and solve for t in years.

10/40 = (1/2)t/28

log(0.25) = (t/28) log(0.5)

t = 28 log(0.25) / log(0.5) years = 56 years

Test the answer:

56 years = 2(28 years) = 2 half-lives, so the remaining amount should be 1/2 of 1/2 of the initial amount, i.e. 1/4 of the initial amount, and 10 mg = 1/4 of 40 mg.
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