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love123jones
01.01.2021 •
Mathematics
All the edges of a cube are expanding at a rate of 4 in. per second. How fast is the volume changing when each edge is 10 in. long
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Ответ:
Given:
All the edges of a cube are expanding at a rate of 4 in. per second.
To find:
The rate of change in volume when each edge is 10 in. long.
Solution:
Let a be the edge of the cube.
According to the question, we get
We know that, volume of a cube is
Differentiate with respect to t.
Putting the given values, we get
Therefore, the rate of change in volume 1200 cubic inches per second.
Ответ:
The diagonal is 421.
Step-by-step explanation:
This is a difficult question. To find the diagonal, you need to find the base and the height of the square. After that, you need to make it a triangle, by using this equation;
(A being area, B being base, and H being height) then find the length of the hypotenuse of the triangle, which I will do for you.
The diagonal is:![421](/tpl/images/0585/0004/34fa1.png)