<span>In this equation, 2(8x-4)-2x = 14x+12 then, solving this we get, 16 x - 8 -2x = 14x +12 or -8-12 = -4x or -20 = -4x or x = 5. Thus, this equation hold true, When we use the equality sign instead of the question mark.</span>
- AB and BC are congruent (given)
- AO and OC are congruent (given)
- BO is congruent with itself (reflexivity)
Taken together, these three facts imply that triangles AOB and COB are congruent (side-side-side congruence postulate).
Now, it's not exactly clear whether A and C lie on the same line (it's possible that the figure is not drawn to scale). If they do, then both angles AOB and COB are right angles, so angle BOK has measure 45º, and so 
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The Surface Area of the sphere is 1017.16 unit^2.
what is the surface area of the sphere?
The surface area of the sphere is 4*pi*r^2.
where, r is the radius
Calculation :
given radius is 9 units
putting value in the formula of the sphere
S(area)=4*pi*r^2
=4*3.14*9^2
=4*3.14*81
=1017.16 UNIT^2
The Surface Area of the sphere is 1017.16 unit^2.
learn more about surface area of the sphere here
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3/4 divided by 1/10
15/2=7.5 miles/hr
