- Do I have Central heterochromia?

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What happen when k2cr2o7added to so2? WHY THE SKY BLUE ? What diploma in engineering needed to apply for biomedical engineering in malaysia for degree? 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? Who is looking for a legit vendor in research chemicals?