- Is -300 a multiple of 2? why?

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Is there a difference between a sinusoidal graph and a trigonometric graph? How to work out the problem "Exess solid Na is added to 54.0 mL of water. How many moles of H2 gas can be produced?"? If f(25) =1 f(x)= (2*f (x+1)+1)/(2) Find f (3)?
Domain can only be plus integers And range can be all real numbers? Within each column, or group, on the periodic table, the differen elements´atoms usually have the same number? Find the values of k for which the equation has two equal real solutions: x^2 + ( k - 1 )x + 1 *I got k= +/- 2* but that s wrong?