A = l x w
A = (x+2) ( 3x)
A = 3x^2 + 6x
answer
Area of a rectangle = 3x^2 + 6x
Answer:
Hope the below answer is easy to understand
Step-by-step explanation:
1) Given the four angles of a quadrilateral are in the ratio 1:2:3:4
Then Let the angles are x,2x,3x and 4x
We know that total of four angles of a quadrilateral =360 °
∴x+2x+3x+4x=360 °
⇒10x=360 °
⇒x=36 °
hence the measures of angles are 36 ° ,72 ° ,108 ° ,144 °
2) Measure of interior angle of a polygon= 180°.
Sides of the polygon = 7 sides
Therefore,
Interior angle of the polygon having 7 sides = 180/7 = 25 5⁄7°
A time of 40.7 minutes is taken for 170 grams of element X to decay to 5 grams.
<h3>How to analyze a radioactive decay case</h3>
Let suppose that element X experiments a <em>simple radioactive</em> decay, that is, that the element X becomes gradually into another less radioactive stable element in time.
We know that decay behaves exponentially and follows this model:
(1)
Where:
- - Initial mass, in grams
- <em>t</em> - Time, in minutes
- <em>τ</em> - Time constant, in minutes
- <em>m(t)</em> - Current mass, in grams
The time constant can be described in terms of half-life (), in minutes, through the following expression:
(2)
If we know that , and , then the time needed for the decay is:
<em>τ ≈ 11.541 min</em>
<em>t ≈ 40.698 min</em>
A time of 40.7 minutes is taken for 170 grams of element X to decay to 5 grams.
To learn more on radioactive decay, we kindly invite to check this verified question: brainly.com/question/27156663
The answer is B because 90 to 30 is 3 over 2
Answer:
C
Step-by-step explanation:
First we distribute (-2,3) into the equations so 2x+4y becomes 2(-2)+4(3) so that's -4+12 which is 8 making equation 1 correct.
Then x+2y becomes (-2)+2(3) which is 4 so the second equation is correct as well therefore the answer has to be C because of process of elimination