Solve.The number of centimeters, d, that a spring is compressed from its natural, uncompressed position is given by the formula 
where W is the number of joules of work done to move the spring and k is the spring constant. Solve this equation for W. Use the result to determine the work needed to move a spring 9 centimeters if it has a spring constant of 0.4.
A. W = 
B. W = 
C. W = 2d2k
D. W = 
Answer: B
Mathematics
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Determine the values of x for which the function is continuous. If the function is not continuous, determine the reason.f(x) = 
A. Not continuous at x ? 4; function not defined B. Not continuous at x = 4; small change C. Not continuous at x = 4; function not defined D. Not continuous at x < 4; function not defined
Mathematics
Multiply and simplify.
? 
A. 
B. 
C. 
D. 
Mathematics
Find the vertices of the hyperbola.4y2 - 36x2 = 144
A. (0, 6), (0, -6) B. (-2, 0), (2, 0) C. (0, 2), (0, -2) D. (-6, 0), (6, 0)
Mathematics
Indicate whether the graph of the equation is a circle, an ellipse, a hyperbola, or a parabola. Then graph the conic section.7x2 = 175 + 7y2
A. parabola
B. hyperbola
C. circle
D. ellipse
Mathematics