- Do you accept or reject Einstein's theory of relativity.?

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When 213 grams of P2O5 is reacted with an excess of H2O, 85 grams of H3PO4 are produced. What is the percent yield? The revenue achieved by selling x caclulators = x(40-.5x) dollars. Each costs 32$. How many will it take to make a profit of at least 27.50$? I need help with this! What are the intervals on which it is increasing? List a pair of numbers that have a gcf of 5? Find the indicated intercepts of the graph of the function:
x- intercepts of f(x)= x^2+7 / x^2 +9x +5
The / indicating a fraction.?