A ball is tossed upward and then falls to the ground. Its height after t seconds is given by the function . At the time the rock reaches its peak, what can be said about ?
?

A.  is positive.
B.  is negative.
C.  is zero.
D. None of the above

Answer: C

Mathematics

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After descending 30 feet, a scuba diver paused to check his equipment before descending an additional 80 feet. Use a signed number to represent the diver's final depth.Final depth = __________ feet

Fill in the blank(s) with the appropriate word(s).

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Determine the direction in which the parabola opens, and the vertex.x = -(y - 8)2 + 1

A. Opens to right; (8, 1) B. Opens to left; (8, 1) C. Opens to left; (1, -8) D. Opens to left; (1, 8)

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Determine whether the given ordered pair is a solution of the system.(3, -1)4x - y = 11 3x - 4y = 5

A. not a solution B. solution

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Find the center, transverse axis, vertices, foci, and asymptotes of the hyperbola. -  = 1

A. center at (0, 0)
transverse axis is x-axis
vertices at (-4, 0) and (4, 0)  
foci at (- 4, 0) and (4, 0)
asymptotes of y = - 3 and y = 3
B. center at (0, 0)
transverse axis is x-axis
vertices at (-4, 0) and (4, 0)  
foci at (-12, 0) and (12, 0)
asymptotes of y = - 3 and y = 3
C. center at (0, 0)
transverse axis is x-axis
vertices at (-12, 0) and (12, 0)  
foci at (- 4, 0) and (4, 0)
asymptotes of y = - 3 and y = 3
D. center at (0, 0)
transverse axis is y-axis
vertices at (0, -4) and (0, 4)  
foci at (- 4, 0) and (4, 0)
asymptotes of y = - 3 and y = 3

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Mathematics