3x+12=2x+40 solve for x
2 answers:
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So firstly, we have to find the radius of the circular garden before finding the circumference (the amount of fencing needed to surround the garden). To find the radius, use the area formula (), plug in the area of the garden (36 ft^2) and solve for r as such:
So that we know the radius, plug that into the circumference equation () to solve:
Your answer is A. 12√π.
To solve this we are going to use the half life equation 
Where:
is the initial sample
is the time in years
is the half life of the substance
is the remainder quantity after years
From the problem we know that:
Lets replace those values in our equation to find:
We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.
Where:
From the problem we know that:
Lets replace those values in our equation to find
We can conclude that after 1600 years of radioactive decay, the mass of the 100-gram sample will be 91.7 grams.