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The right answer is Option C.
Step-by-step explanation:
Given,
Area of post it note = A square inches
Width of post it note = 4 inches
Length of post it note = X
We know that;
Area = Length * Width
As we have to find length, we will divide both sides by 4
The equation represents the length of post it notes in inches.
The right answer is Option C.
Keywords: area, multiplication
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Answer:
Where represent the half life and the intial amount would be
And we want to find the time in order to have a 95% of decay so we can set up the following equation:
If we apply natural log on both sides we got:
And solving for t we got:
So then would takes about 14.26 hours in order to have 95% of the lead to decay
Step-by-step explanation:
For this case we can define the variable of interest amount of Pb209 and for the half life would be given:
Where represent the half life and the intial amount would be
And we want to find the time in order to have a 95% of decay so we can set up the following equation:
If we apply natural log on both sides we got:
And solving for t we got:
So then would takes about 14.26 hours in order to have 95% of the lead to decay