Find the focus and directrix of the parabola with the given equation.x = 3y2
A. focus: 
directrix: x = - 
B. focus: 
directrix: x = 
C. focus: 
directrix: x = - 
D. focus: 
directrix: y = - 
Answer: A
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Solve the problem.The position (in centimeters) of an object oscillating up and down at the end of a spring is given by 
at time t (in seconds). The value of A is the amplitude of the motion, k is a measure of the stiffness of the spring, and m is the mass of the object. How fast is the object moving when it is moving fastest?
A. 
cm/sec
B. A cm/sec
C. A
cm/sec
D. A
cm/sec
Find the sum of the geometric series for those x for which the series converges.
A. 
B. 
C. 
D. 
Draw the given angle.70°
A. 
B. 
C. 
D. 
Find the coordinates of the vertex for the parabola defined by the given quadratic function.f(x) = (x + 4)2 + 8
A. (-8, 4) B. (-4, 8) C. (8, -16) D. (8, -4)