Answer:
24 centimeters
Step-by-step explanation:
7 + 7 + 5 + 5 = 24
have a nice day :)
The half-life of the radioactive substance is 67.95 hours.
2x - 5 = 7
2x = 7 + 5
2x = 12
x = 12 / 2
x = 6
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