Express in scientific notation. choose the answer with the proper number of significant figures. a). 20. x 10^26 b). 10 x 10^26 c). 2 x 10^27

Two things that biomedical has invented or innovated

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

Answer asap need by wednesday morning calculate the ph of 0.036m naoh best answer will be brainliest