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) = (4 cos t)i + (3 sin t)j
A. a = (4 cos t)i + (3 sin t)j
B. a = (-4 sin t)i + (-3 cos t)j
C. a = (-4 cos t)i + (-3 sin t)j
D. a = (4 sin t)i + (3 cos t)j
Answer: C
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Solve.A boat goes 560 miles downstream in the same time it can go 490 miles upstream. The speed of the current is 3 miles per hour. Find the speed of the boat in still water.
A. 105 mph B. 48 mph C. 42 mph D. 45 mph
Use exponential notation to write the repeated multiplication.8 ? 8
A. 2 ? 8 B. 83 C. 28 D. 82
Sketch the graph of the function 
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Provide an appropriate response.Multiply and simplify: (x3 - 9)(x3 + 9)
What will be an ideal response?