Simplify the series of additions and subtractions.9 + (-20) - 17 - (-13) + (-9)
A. -24
B. 42
C. -50
D. -16
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.r(t) = (cos 2t)i + (4 sin t)jFind the acceleration vector.
A. a(t) = (-4 cos 2t)i + (-16 sin t)j B. a(t) = (-4 cos 2t)i + (-4 sin t)j C. a(t) = (4 cos 2t)i + (-4 sin t)j D. a(t) = (-2 cos 2t)i + (4 sin t)j
Mathematics
Rotate the axes to eliminate the xy-term in the equation. Then write the equation in standard form.
a. 
b. 
c. 
d. 
e. 
Mathematics
Solve the problem.Find the perimeter of a triangle with sides measuring 2
, 2
, and 2
meters.
A. (8
+ 4
) m
B. (8
+ 4) m
C. (8 + 4
) m
D. 12
m
Mathematics
Decide whether or not the ordered pair is a solution of the system.(-5, 1)3x + y = -144x + 3y = -17
A. No B. Yes
Mathematics