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Zuno8604
28.01.2021 •
Mathematics
The numerical value of the volume of a sphere is equal to the numerical value of its surface area. Find the exact value of the radius of this sphere.
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Ответ:
The radius of this sphere is
.
Step-by-step explanation:
The volume of a sphere of radius
is:
The surface area of a sphere of radius
is:
Equate the right-hand side of these two expressions and solve for
:
In other words, the radius of this sphere is
.
Ответ:
y= -1x + 8
Step-by-step explanation:
so we have to know that the side of Triangle DEF that is parallel segment BC is EF.
we know that the side EF contains the coordinates (4,4) and (6,2).
So we could use this to find the slope for side EF by finding the difference in the y values and dividing it by the difference in the x values.
4-2= 2
4-6= -2
2/-2= -1 so the slope is negative one.
Now we have to find the y-intercept so we could plot in the x and y values and the slope into the equation y=mx + b to find the y-intercept.
In the coordinates (6,2) 6 is the x value and 2 is the y value.
so we put it like this 2=-1(6) + B where -1 is the slope.
2= -6 + b add 6 to both sides and b= 8.
so now we know the slope and the y-intercept so we will write the equation like this. y= -1x + 8