Find the focus and directrix of the parabola with the given equation.x2 = 28y
A. Focus: (0, 7), directrix: y = -7
B. Focus: (7, 0), directrix: x = -7
C. Focus: (-7, 0), directrix: x = 7
D. Focus: (0, -7), directrix: y = 7
Answer: A
Mathematics
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Solve the problem.A piece of cardboard is 0.04 in. thick. The cardboard is cut in half, with one half being placed on top of the other so that its thickness doubles for 8 times in a row. How thick would the final stack of cardboard be? Round to two decimal places.
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Mathematics