Solve the system of equations by graphing, and then give the value of x.
?
?
A. 6
B. -4
C. -2
D. 4
E. 10
Answer: D
Mathematics
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The position vector of a particle is r(t). Find the requested vector.The acceleration at t = 
for r(t) = (7t - 4t3)i + 2tan(3t)j + e5tk
A. a
= - 2?i + 72j + 25e5/12?k
B. a
= - 2?i - 72j + 25e5/12?k
C. a
= - 2?i - 72j + 25k
D. a
= 2?i + 72j + 25e5/12?k
Mathematics
Find the vertex, focus, and directrix of the parabola. Graph the parabola.x2 = -12y
A. vertex: (0, 0)
focus: (-3, 0)
directrix: x = 3
B. vertex: (0, 0)
focus: (3, 0)
directrix: x = -3
C. vertex: (0, 0)
focus: (0, 3)
directrix: y = -3
D. vertex: (0, 0)
focus: (0, -3)
directrix: y = 3
Mathematics
Find the square.(n + 14)2
A. n2 + 196 B. n + 196 C. 196n2 + 28n + 196 D. n2 + 28n + 196
Mathematics
Solve the equation.-8b + 3 + 6b = -3b + 8
A. -3 B. 5 C. -8 D. 8
Mathematics