Find the equation of the parabola corresponding to the given information.The parabola has focus ( - 1 , 0 ) and directrix x = 1.
A. x = 
y2
B. x = - 
y2
C. y = 
x2
D. y = - 
x2
Answer: B
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The concentration D of a drug, in milligrams per deciliter, in the blood t hours after an injection is given by 
. What is the eventual concentration of the drug in the blood?
A. About 4.07 milligrams per deciliter B. About 8.68 milligrams per deciliter C. About 4.61 milligrams per deciliter D. 0 milligrams per deciliter
Find the unit vector having the same direction as v.v = -12i - 5j
A. u = 
i + 
j
B. u = -156i - 65j
C. u = - 
i - 
j
D. u = - 
i - 
j
Match the equation of the ellipse with the appropriate description.
= 1 - 
A. x-intercepts (9, 0), (-9, 0); y-intercepts (0, 25), (0, -25) B. x-intercepts (3, 0), (-3, 0); y-intercepts (0, 5), (0, -5) C. x-intercepts (5, 0), (-5, 0); y-intercepts (0, 3), (0, -3) D. x-intercepts (25, 0), (-25, 0); y-intercepts (0, 9), (0, -9)
Solve the problem.Find the sum of all the integers from 56 to 97.
A. 3116 B. 3157 C. 3060 D. 3213