7⁵/7-y= 7²⁵ please any one know then solve this

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Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

Classify this reaction: 2al+n2-> aln.

What type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? view available hint(s) what type of interaction occurs between the r groups of valine and isoleucine in a tertiary structure? salt bridge disulfide bridge hydrogen bond hydrophobic interaction