Jones like to watch the bird in her yard one morning she notices that there were twice as many robins as Blue Jays. if she count
2 answers:
Call the number of robins 'r' and the number of blue jays 'b'.
We are told there are twice as many robins as blue jays, thus:
We are also told there are 21 birds total:
By substitution:
Then using the other equation with known values:
There are 7 blue jays and 14 robins.
Check by backsubstitution:
CHECKS.
We are told there are twice as many robins as blue jays, thus:
We are also told there are 21 birds total:
By substitution:
Then using the other equation with known values:
There are 7 blue jays and 14 robins.
Check by backsubstitution:
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Given:
A figure of combination of hemisphere, cylinder and cone.
Radius of hemisphere, cylinder and cone = 6 units.
Height of cylinder = 12 units
Slant height of cone = 10 units.
To find:
The volume of the given figure.
Solution:
Volume of hemisphere is:
Where, r is the radius of the hemisphere.
Volume of cylinder is:
Where, r is the radius of the cylinder and h is the height of the cylinder.
We know that,
[Pythagoras theorem]
Where, l is length, r is the radius and h is the height of the cone.
Volume of cone is:
Where, r is the radius of the cone and h is the height of the cone.
Now, the volume of the combined figure is:
Therefore, the volume of the given figure is 2110.08 cubic units.