Answer:
49π
Step-by-step explanation:
The formula for the area of a circle is,
If the radius is 7 inches we need to plug that in for r in the formula.
π(7)^2
7*7 = 49
<em>Thus,</em>
<em>the area in terms of pi is 49π.</em>
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<em>Hope this helps :)</em>
Answer:
Hi there!
Step-by-step explanation:
Your question was: 21*0.64 right?
Well, the answer to your question is 13.44
This is how we multiply;
21
X 0.64
________
84
+ 1260
_________
1344
(Don’t forget to place the decimal!)
So now we have 1344, let’s place the decimal!
=> the decimal should be placed here: 13.44
Hope this helps!
~Have a great day!~
If you have any questions feel free to ask!
(Just in case if you didn’t understand my explanation, I attached a picture..of how we are supposed to multiply “21*0.64”)
Answer:
40 years after 1982, there is 396.85 kilograms of radioactive element remaining. The area will not be safe for human habitation by 2022.
Step-by-step explanation:
We are given the following in the question:
where f(x) is the amount of normal curve cannot be used as an approximation to the binomial probability. in kilograms x years after 1982.
We have to approximate f(40)
Putting x = 40, we get
Thus, 40 years after 1982, there is 396.85 kilograms of radioactive element remaining.
With 100 kilograms of radioactive material, the area is unsafe for humans.
Thus, the area will not be safe for human habitation by 2022.