Answer:
300 kilometers per hour
Step-by-step explanation:
See the step-by-step solution in the picture attached below.
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Answer:
60.5 milligrams per square centimeter First, determine how many half lives have expired by dividing the time by the half-life. So: 55/20 = 2.75 That means that only 2^(-2.75) = 0.148650889 = 14.8650889% of the original substance remains. So just divide the amount remaining by 0.148650889 to get the original amount. 9 / 0.148650889 = 60.5445419 So originally, there was 60.5 milligrams per square centimeter 55 years ago.
Isolate the y to one side so we get: y = 2x - 1
The slope of the line is 2.
