Answer:
Y = 6 and x=6 are perpendicular because they both measure at a 90 degree angle
First find the length of the diagonal of a square of side 4 inches:
d^2 = 4^2 + 4^2 = 2*4^2 = 32. Then the diagonal of the cube has length
sqrt( 32 + 4^2) = sqrt(32+16) = sqrt(48) = 4sqrt(3).
Imposible triangle, lagest side must be > sum other sides.
The answer is 60 because 10 x 2 is 20 and 5 x 8 is 40 and add those together to get 60
It follows from the definition of the binomial coefficient:
So we have
That is, 
gets absorbed into the numerator's factorial, and we introduct 
into the denominator. Now, 
, so we get
as required.
