Solve for x.4-x = 
A. {2}
B. 
C. 
D. {-2}
Answer: A
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) = (cos 2t)i + (5 sin t)j
A. a = (-4 cos 2t)i + (-5 sin t)j B. a = (-2 cos 2t)i + (5 sin t)j C. a = (-4 cos 2t)i + (-25 sin t)j D. a = (4 cos 2t)i + (-5 sin t)j
Mathematics
Solve the problem.The voltage E in an electrical circuit is given by E = 1.2 cos 80?t, where t is time measured in seconds. Find the amplitude.
A. 1.2 B. 80? C. 2.4 D. 80
Mathematics
Maximize the function f(x, y) = 2x + y subject to the constraint 
Enter your answer exactly in the form 
What will be an ideal response?
Mathematics
Divide and simplify. Assume that all expressions under radicals represent positive numbers.
A. 
B. 2mn
C. 4
D. 2
Mathematics