- How does sea-level pressure differ from station pressure? Can the two ever be the same? Explain.?

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What is the largest prime factor of 255? Please help with question below Thanking you in advance? Could I replace my blood with red punch? Rectangular form? is it even possible for the equation below? Alguém pode me ajudar nessas duas questões?
a)f(x)= log7 (x^2-4x). log3(5x-x^2)
b) log2^x + log (1+2^x)=log20?