Your welcome! 3.66 is your right answer!
Answer:
B) 9π in^2
Step-by-step explanation:
Circumference of a circle is C = πD
Divide 6π by π to get 6 then divide by 2 to get the radius of the circle
Area of a circle is A = πr^2
6/2 = 3 3 = r
π(3)^2 = 9π
Answer:
The numbers are 20 and 140
Step-by-step explanation:
<u><em>The question in English is</em></u>
Find 2 numbers knowing that the second number is 7 times greater than the first, and the sum between the double of the first number and the triple of the second is 460
Define the variables
Let
x ----> the first number
y ----> the second number
we know that
-----> equation A
----> equation B
Solve the system of equations by substitution
Substitute equation A in equation B
solve for x
<em>Find the value of y</em>
---->
The numbers are 20 and 140
Answer:
i.e. 393650 kg.
Step-by-step explanation:
Given that Radium-226 is a radioactive substance with an annual decay rate of 0.04 %
Let the year 1937 be 0 year
Initially population was = 400,000 kg
Since decay rate is 0.04% per year after t years population would be
=
In 2017, t = 40 years (i.e. years lapsed form 1937)
Hence population
=
i.e. 393650 kg.
She had 12 cookies and her brother ate 9 of them ,how many did he leave out of her 12?