Find the vertex, focus, and directrix of the parabola. Graph the parabola.x2 - 10x + 8y + 65 = 0
A. vertex: (5, -5)
focus: (7, -5)
directrix: x = 3
B. vertex: (5, -5)
focus: (3, -5)
directrix: x = 7
C. vertex: (5, -5)
focus: (5, -7)
directrix: y = -3
D. vertex: (5, 5)
focus: (5, 3)
directrix: y = 7
Answer: C
You might also like to view...
Match the vector equation with the correct graph.r(t) = 3i - 2j - tk; -1 ? t ? 1
A. Figure 8 B. Figure 6 C. Figure 3 D. Figure 5
Solve the equation. - 1 = x
A. 3 B. 0 C. 0, 2 D. 0, 3
Provide an appropriate response.True or false? If a < 0, then = j
.
A. True B. False
Solve the problem.The decibel level D of a sound is related to its intensity I by . If Io is 10-12, then what is the intensity of a noise measured at 63 decibels? Express your answer in scientific notation, rounding to three significant digits, if necessary.
A. 6.3 × 10-10 watt/m2 B. 5.45 × 1014 watt/m2 C. 2 × 10-6 watt/m2 D. 2 × 10-5 watt/m2