500,000
(5 or above, give it a shove)
Answer:
3x45y+3+4
Step-by-step explanation:
The answer for that equation would be 2-5x and 3x +4
Combinations
nCr
you have n items and how many ways are there to chose r of them
nCr=

remember than n! means n times all numbers before like
3!=3*2*1, 5!=5*4*3*2*1
9 stations, how many ways are there to chose 6 of them
9C6=

=

=

=

=

=
84
84 ways