If x is less than 81, then we get a solution, but x should also be larger than or equal to zero since radicands must be nonnegative, therefore, <span>x<81.
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Answer: 
Step-by-step explanation:
If the volume of a sphere is
Where 
is the radius
The volume of a hemisphere is half the volume of the total sphere:
Solving this equation:
Finally:
Answer:the answer would be 8.
Step-by-step explanation:
If you look at the reduced triangle, the height is 2. Therefore you would have to multiply by 4 instead of 0.4 even if the scale factor is 0.4. The reason is, you are enlarging the triangle to find the bigger triangle. If you did 0.4 times 2 you would get 0.8. But that wouldn’t make any sense if you said that that was the height of the ENLARGED triangle.
Step-by-step explanation:
All the sides of the triangle are equal
Therefore, it is a equilateral triangle
and all angles measure 60°.
So, 25x-15= 60
25x = 60+15= 75
x= 75/25
x= 3
2y = 60
y=30
optionA
