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42. Give the vertex of this equation: 2x- - 8x + y -7 =0.
a. (-2, 15)
b. (15, 2)
C. (-15, 2)
d. (2, 15)
43. A ball on a pendulum moves 50 cm on its first swing. On each succeeding swing back or forth it moves
60% of the distance of the previous swing. Write the first four terms of the sequence of swing lengths.
a.
50, 30, 18, 10.8
b.
30, 18, 10.8, 6.48
C.
50, 20, 8, 3.2
d.
50, 30, 10, -10
44. Write an equation of a parabola with vertex (0, 0) and directrix x = 2.
a.
b.
8
G.
d.
45. Find the sum of this series: -8000 + 2000 -500 + 125 -...; 7&quot; term.
a.
-10667.318
b.
-6400.391
C.
-8632.478
d.
-12443.453

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