Answer:
Its not b since thats what i just got wrong on the test so your down to 3 options
Step-by-step explanation:
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Answer : The substances half life in days is, 5.6 days.
Step-by-step explanation :
Half life : It is defined as the amount of time taken by a radioactive material to decay to half of its original value.
All radioactive decays follow first order kinetics.
The relation between the half-life and rate constant is:

where,
k = rate constant = 0.1235 per days
= half-life
Now put all the given values in the above formula, we get:


Thus, the substances half life in days is, 5.6 days.
Answer:
False
Step-by-step explanation:
A square and a parallelogram could have proportional sides but the angles would not be the same