Depends is the positive integer is larger than the negative interger for example -10+5=-5.
10+-4=6
Answer:
so, the figure here is a cylinder with a semi sphere on the top, we know the height of whole structure, and the radius of the semi sphere, which is the same as the radius of the cylinder (you can see it because the radius of the semisphere is constant, and you can thin on it as half a sphere over a cylinder).
First, the cylinder will be the structure without the semi sphere, so his height will be te total height minus the radius of the semi sphere, which is 0.9μm.
so now we know the height and the radius of the cylinder, the surface or the sides of it is 2*3.14*r*h = 2*3.14*0.9μm*0.1μm = 0.5662
.
To complete the square:
we take the coefficient ox "x" (which in this problem is -20)
we divide it by 2
square that number
then add it to both sides of the equation
-20 / 2 = -10
-10^2 = 100
then we add 100 to both sides of the equation:
x^2 -20x
x^2 -20x +100 = 100
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To get the roots of the equation, we take the square root of both sides:
(x -10) * (x-10) = 10
(x-10) = square root (10)
x-10 =
<span>
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<span>
3.1622776602
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x1 =
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<span>
13.1622776602
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and don't forget that square root of 10 also equals </span></span><span><span><span> -3.1622776602
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</span>
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x2 = 10
-<span>
<span>
<span>
3.1622776602
x2 = </span></span></span>
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6.8377223398
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</span>
</span>
The answer would be answer choice B.
