Find the focus and directrix of the parabola with the given equation.x2 = 4y
A. Focus: (0, -1), directrix: y = 1
B. Focus: (1, 0), directrix: x = -1
C. Focus: (0, 1), directrix: y = -1
D. Focus: (-1, 0), directrix: x = 1
Answer: C
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The following table shows the gross national product G, in trillions of dollars, t years after 2005. Use the regression line for the data to estimate the gross national product in 2013. t 0 1 3 5 G 12.76 13.54 14.29 14.66? ?
A. 15.95 trillion dollars B. 16.55 trillion dollars C. 17.80 trillion dollars D. 18.35 trillion dollars
Plot the indicated graphs.The intensity level B (in dB) and the frequency f (in Hz) for a sound of constant loudness were measured as follows:
Plot the data for B as a function of f on semilog graph paper, using the logarithmic scale for f.
What will be an ideal response?
Provide an appropriate response.Factoring (x + 1)(x - 3) + (x + 7)(x - 3) gives
A. (x + 1)(x +7)(x - 3)2 B. (x -3)(2x - 2) C. 2(x - 3)(x + 8) D. (x + 1)(x +7)(x - 3) E. 2(x - 3)(x + 4)
Graph the integrand and use areas to evaluate the integral.
A. 30
B. 45
C. 90
D. 