The table below shows some properties of germanium, discovered in 1886 by Clemens Winkler. Germanium was Mendeleev's predicted eka-silicon. Why did its discovery support Mendeleev's ideas?
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What do radio waves and microwaves have in common? both are at the side of the spectrum that has the shortest wavelengths. both are at the side of the spectrum that has the lowest radiant energy. both are at the side of the spectrum that has the lowest frequency. both are found next to visible light on the electromagnetic spectrum.

Let f(x) = x4- 8x2 . find the relativeextrema of this function using the second derivative test.

Carbon 14 is a naturally occurring stable