- What really gives or causes our earth to have gravity?

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A laser pulse with wavelength 545 nm contains 4.40 mJ of energy. How many photons are in the laser pulse? Discrete mathematics: prove ∑-(k=1)^n▒〖k^2=(n (n+1)(n+2))/6〗 for all n≥1? Write a balanced equation for the reaction of h2 and o2 to form steam h2o? I took my blood pressure and it was 123/92 and I few minutes later I took it and it was 120/80 witch should I believe? How do we conclude if our data is statistically significant from standard deviation?

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