Solve the problem.If a rock falls from a height of 70 meters above the ground, the height H (in meters) after x seconds can be approximated using the formula H = 70 - 4.9x2. What is the height of the rock after 2 seconds?
A. 60.2 m
B. 260.4 m
C. -26.04 m
D. 50.4 m
Answer: D
Mathematics
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A. (y + 2)2 = 6(x - 5) B. (y - 2)2 = 6(x - 5) C. (y - 2)2 = 6(x + 5) D. (y + 2)2 = -6(x - 5)
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Solve the equation in the real number system.3x3 - 17x2 + 18x + 8 = 0
A. 
B. 
C. 
D. 
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The function f is one-to-one. Find its inverse.f(x) =
A. f-1(x) = x - 2
B. f-1(x) = x3 - 2
C. f-1(x) = x3 + 4
D. f-1(x) = 
Mathematics
Solve the equation by completing the square.5x2 - 4x - 9 = 0
A. 
, -1
B. 
, -1
C. 
, 1
D. 
, 0
Mathematics