Use the dot product to find the magnitude of u if 
A. 
B. 
C. 
D. 
E. ?
Answer: E
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Find the equation of the tangent plane (or tangent "hyperplane" for a function of three variables) at the given point p.f(x, y, z) = 3x2 - 3y2 + yz2, p = (-1, 1, -1)
A. w = -6x - 6y - 2z - 2 B. w = -6x - 5y - 2z + 4 C. w = -6x - 5y - 2z - 2 D. w = -6x - 5y + 2z - 2
A container contains a large unspecified number of ping-pong balls. A student takes 80 balls from the container, marks them with a blue dot, returns the marked balls to the container, and thoroughly mixes the balls. She then takes 80 balls again from the container. Of these, 16 have blue dots. She now wants to use this data to estimate the total number of ping-pong balls in the container.The best estimate for the percentage of ping-pong balls in the container that are marked is
A. 15%. B. 5%. C. 10%. D. 20%. E. none of these
Solve the inequality. Graph the results.-4x + 7 ? -5x + 10
A. x > -4 
B. x ? 3 
C. x < -4 
D. x ? 3
Solve the problem.The surface area S of a sphere with radius r is given by the formula 
If a sphere has surface area 
square inches, what is its radius?
A. 16 in. B. 4? in. C. 4 in. D. 8 in.