A group of k elements can be chosen from a group of n elements in

ways.

There are 20 different 3-member groups.
Yes, they can. Rational numbers are also decimals (for example) so we can put an infinite amount of numbers between any 2 values, for example:
1,1
1,11
1,111
1,1111
2
5,328
5,3281
5,3282
50
90,01
90,011
etc.
Answer:
Step-by-step explanation:
I think you need to first find the surface area for the 3 composite shapes which is the cube and the two triangular pyramids.
Once you have the surface area for all the three, then just add all of them together.
Answer:

Step-by-step explanation:
Formula for Cone: π
Since we have all the components, we can find the volume of the cone.
R = 10
H = 4
π
10×10 = 100
100π
×100
4 100 400
--- × ----- = ------
3 1 3
Answer: 
Hope this helped.
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