Solve the inequality and write the solution set in interval notation.2x > 0
A. ?
B. (-?, 0)
C. (0, ?)
D. (-?, ?)
Answer: C
Mathematics
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If r(t) is the position vector of a particle in the plane at time t, find the indicated vector.Find the acceleration vector.r(t) = (7 ln(3t))i + (9t3)j
A. a = - 
t-2i + 54tj
B. a = 
t-2i + 54tj
C. a = - 
i + 54tj
D. a = 
i + 27tj
Mathematics
Solve the system of equations by elimination.
A. x = -4, y = 7; (-4, 7) B. x = 9, y = -9; (9, -9) C. x = -7, y = 7; (-7, 7) D. x = 7, y = -7; (7, -7)
Mathematics
Graph the hyperbola.
- 
= 1
A. 
B. 
C. 
D. 
Mathematics
Solve the equation for the indicated variable.d = rt, for r
A. r = d - t
B. r = 
C. r = 
D. r = dt
Mathematics