Answers

2016-07-24T14:03:54+08:00
360. If you mean 5(x)(90(x)/5) when x is 2. 
0
PEMDAS. Just substitute 2 into the equation from left to right
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2016-07-24T14:05:27+08:00
5(2)•90(2)÷5!
10•180÷5!
1800÷5!
X=15
1 5 1
Hey man. I'm just testing this app and thanks for the solution... Next time I have much harder questions to ask...