Provide an appropriate response.Suppose that A and B are both matrices of dimension r × s. Under what conditions can both the product AB and the product BA be found?
A. If r = 1
B. If r > 1
C. If r = s
D. There are no conditions under which both products can be found.
Answer: C
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Solve the problem.At time t, the position of a body moving along the s-axis is 
m. Find the body's acceleration each time the velocity is zero.
A. a(20) = 120 m/sec2, a(16) = 20 m/sec2 B. a(10) = -6 m/sec2, a(8) = 6 m/sec2 C. a(10) = 0 m/sec2, a(8) = 0 m/sec2 D. a(10) = 6 m/sec2, a(8) = -6 m/sec2
Graph the ellipse.16x2 + 49y2 = 784
A. 
B. 
C. 
D. 
Find the indicated probability or percentage for the normally distributed variable.The mean clotting time of blood is 7.35 seconds, with a standard deviation of 
The times are approximately normally distributed. What is the probability that a randomly selected blood clotting time will be less than 7 seconds?
A. 0.363 B. 0.156 C. 0.159 D. 0.841
Simplify.(-15)
- 3 ÷ 
A. -9 B. 9 C. 3 D. -3