Solve the problem. Round your answer to the nearest tenth, if necessary.On a biology test, a student got 25 questions correct but did not pass. On a second attempt, the student got 30 questions correct. What was the percent of increase in correct answers?
A. 80%
B. 16.7%
C. 5%
D. 20%
Answer: D
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Use implicit differentiation to find dy/dx.2xy - y2 = 1
A. 
B. 
C. 
D. 
Find the foci of the hyperbola.4y2 - 25x2 = 100
A. (0, 
), (0, -
)
B. (
, 0), (-
, 0)
C. (0, 
), (0, -
)
D. (
, 0), (-
, 0)
Find T, N, and B for the given space curve.r(t) = 
i + 
j + 3tk
A. T = 
(cos 0.571t)i - 
(sin 0.571t)j ; N = (-sin 0.571t)i - (cos 0.571t)j ; B = 
(cos 0.571t)i - 
(sin 0.571t)j - 
k
B. T = 
(sin 0.571t)i - 
(cos 0.571t)j ; N = (-sin 0.571t)i - (cos 0.571t)j ; B = 
(cos 0.571t)i - 
(sin 0.571t)j - 
k
C. T = 
(cos 0.571t)i - 
(sin 0.571t)j + 
k ; N = (-sin 0.571t)i - (cos 0.571t)j ; B = - 
k
D. T = 
(cos 0.571t)i - 
(sin 0.571t)j + 
k ; N = (-sin 0.571t)i - (cos 0.571t)j ; B = 
(cos 0.571t)i - 
(sin 0.571t)j - 
k
Convert the given product to a single radical. Assume that all variables represent positive numbers.
? 
A. 
B. 
C. 
D. 