Find the equation of the parabola described.Focus at (0, 18); directrix the line y = -18
A. x2 = -72y
B. x2 = 72y
C. y2 = 72x
D. y2 = 18x
Answer: B
Mathematics
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Provide an appropriate response.Find the direction in which the function is increasing most rapidly at the point P0.f(x, y, z) = xy - ln(z), P0(1, -2, 2)
A. 
(-4i - 2j + k)
B. 
(-4i + 2j - k)
C. 
(-4i + 2j - k)
D. 
(-4i + 2j - k)
Mathematics
Round the number to the place value indicated.21,629,336
A. 21,629,000 B. 21,000,000 C. 22,000,000 D. 21,700,000
Mathematics
Solve the problem.The Lucas sequence LN is given by 1, 3, 4, 7, 11, 18, 29, 47, 76, 123, . . . .Note that 
From this, we might conjecture that the value of LN =
A.
?N+1 + 
B.
?N + 
C.
?N + 
D.
?N - 
E. none of these
Mathematics
Find the volume of the solid. 
A. 80 cu ft B. 15 cu ft C. 240 cu ft D. 10 cu ft
Mathematics