Find the focus and directrix of the parabola with the given equation.9y2 = -4x
A. Focus: 
, directrix: x = - 
B. Focus: 
, directrix: y = 
C. Focus: 
, directrix: y = 
D. Focus: 
, directrix: x = 
Answer: D
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Solve the problem.The radius r and height h of a cylinder are changing with time. At the instant in question, 
and 
At what rate is the cylinder's volume changing at that instant?
A. 0.13 cm3/sec B. -0.06 cm3/sec C. 0.25 cm3/sec D. 1.01 cm3/sec
Verify that each equation is an identity.cot x sec4 x = cot x + 2 tan x + tan3 x
What will be an ideal response?
The slope of the tangent line to the graph of the exponential function y = 6* at the point (0, 1) is 
Estimate the slope to three decimal places.
a. 2.197 b. 1.946 c. 2.303 d. 1.792 e. 1.609
Find the exact value of sin 2x given that sec x = figure 1.png)
, csc y = 3, and x and y are in quadrant I.
 figure 2.png)