- Deduce the valency of the element 9A.?

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Who is looking for a legit vendor in research chemicals? Express 9 3/8 as improper fraction? How can we differentiate between alcohol and ether by chemical tests? What kind of bug is this? I was just watching a show in bed and it started crawling on my arm. Also, is it harmful? The function f is f(x)= (x+4)(x-a), the graph of f is a parabola , a is const. The x coord. is b/w 1 and 3, which is a?
A. -2
B. 1
C. 5
D. 9?