- Express 4.6 in scientific notation?

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What are some things about bears? What happens if a black hole made from antimatter collided with one made from matter? Why does sqrt(4)-sqrt(16) not equal two? If sqrt(4) equals +-2 and sqrt(16) equals +-4, then could you not say -2+4 = 2? Integral from 0 to 4 of absolute value of (x^2 -4x +3) dx. I keep getting 4/3 and not 4...? If there are 4- forces of nature, why not one ? who can finish the work of Einstein ?