Find: a. The center and radius of the circle. b. The x- and y-intercepts of the graph of the circle.5x2 + 5y2 - 4y = 0
A. a. center = 
; radius = 
b. (0, 0), 
B. a. center = 
; radius = 
b. 
C. a. center = 
; radius = 
b. (0, 0), 
D. a. center = 
; radius = 
b. (0, 0)
Answer: C
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Find the principal unit normal vector N for the curve r(t).r(t) = (t2 + 3)j + (2t - 4)k
A. N = 
j - 
k
B. N = - 
j + 
k
C. N = 
j - 
k
D. N = - 
j + 
k
Solve the problem.Consider the graph of f(x) = 
, 0 ? x ? 1. What symmetry does the graph have? Is f its own inverse?
A. The graph of f is symmetric with respect to the y-axis. The function f is its own inverse because (f?f)(x) = x. B. The graph of f is symmetric with respect to the y-axis. The function f is not its own inverse because (f?f)(x) = |x|. C. The graph of f is symmetric with respect to the line y = x. The function f is its own inverse because (f?f)(x) = x. D. The graph of f has no symmetry. The function f is not its own inverse because there is no symmetry.
Find the mass of the wire that lies along the curve r and has density ?.r(t) = 
i + 3tj, 0 ? t ? 1; ? = 4t
A. 
units
B. 
units
C. 2 units
D. 
units
Divide. Simplify, if possible.5.4 ÷ (0.6)
A. 4.8
B. 
C. 48
D. 9