ElectricPavlov

Here is my 'stab' at it    (BE WARNED:I often get these answers incorrect)

4   ways to pick the host team          4

EACH of remaining 3 teams have 7c2 ways to pick committee members     7c2 * 7c2 * 7c2

and the host team has 7c3 ways to pick committee members       7c3

4*  7c2 * 7c2 * 7c2 * 7c3 = 4 x 21 x 21 x 21 x 35 = 1296540 ways

(I hope I got this one!)

Gothcha....   I didn't present the formula 'slop'..... that was another 'guest' poster....I just brute force listed all of the combos .....

 (Sometimes I just answer a few Qs and don't get around to signing in to the forum.....then my name gets attached the next time I DO sign in to the forum)

G'day (again)!   (sometimes sarcastic....sometimes not)

The 10^6  means 'move the decimal SIX places to the right'

3 978 000 .   km      'B'

Area of square (or rectangle) = Length x Width  units^2    (for a SQUARE   L & W are equal)

Area of a triangle = 1/2 Base x height   units^2

Area of a rectangle = L  x  W

                                = 7.3 x 4.1   m^2      OK?   (I do not know what the 9. is in your question...typo?) 

sin 60 = AB/4         (sin = opposite/hypotenuse)

sqrt3 / 2 = AB/4

4 sqrt3 / 2 = AB

AB= 2 sqrt(3)

Are the 7 players taking biology ONLY...or are the 2 players taking 'BOTH' included in this 7 count?

Unclear as how to proceed.....

Need a diagram for this one.....or some measurements are missing.  Sorry.....

  I have no idea who Mr BB is, WildChild.... I just deleted an incorrect answer I had posted as I was responding with a different (at least my second 'guess' was correct) answer to another poster.

G'Day!  

2t-30