Find the focus and directrix of the parabola with the given equation.x2 = 16y
A. focus: (4, 0)
directrix: y = 4
B. focus: (0, -4)
directrix: x = -4
C. focus: (4, 0)
directrix: x = 4
D. focus: (0, 4)
directrix: y = -4
Answer: D
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Determine the equation of the given line, as well as the slope of the line. If the slope is undefined, state this.
A. y = x - 8, m = 1 B. y = -4, m = 0 C. x = -4, m = 0 D. y = x - 4, m: undefined
An x-ray of a patient's leg is done with a current setting of 30mA for a time of 1s. If none of the distances is changed and the current is increased to 60mA, what should the exposure time be?
A. 2s B. 4s C. 0.5s D. 0.25s
Solve the equation.-5a + 5 + 6a = 14 - 24
A. a = -15 B. a = -43 C. a = 43 D. a = 15
Perform the indicated operation and simplify. Write the result in the form a + bi.(1 + 5i)2
A. -24 + 10i B. 1 + 10i + 25i2 C. 26 + 10i D. -24 + 0i