- 1/2 times 12?

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I have 7 times as many quarters as I do nickels. If the total value of the quarters and nickels is $19.80, how many quarters do I have? How would the input and output waveforms differ for sinusoidal input if the circuit were a differentiator? (741 op amp in dc circuit)? How does speciation occur? How do you find the Fourier cosine and sine transforms of e^(-kx) where k > 0? Write an equation of the line perpendicular to the line given by 3x-2y=9 and having the same y-intercept as the line given by 2x+5y=0?