The dimensions of two matrices are given. Find the dimensions of the product AB and the product BA. If either is not defined, say so.A is 2 × 1; B is 1 × 1.
A. AB is 2 × 2; BA is 1 × 1.
B. AB is 1 × 2; BA is 1 × 1.
C. AB is not defined; BA is 1 × 2.
D. AB is 2 × 1; BA is not defined.
Answer: D
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A statement is made about correlation. State whether the correlation is positive or negative and whether the correlation is most likely due to coincidence, a common underlying cause, or a direct cause.As the temperature has been rising over the past three months, the Dow Jones Industrial Average has also been rising.
A. Positive correlation; coincidence B. Positive correlation; common underlying cause C. Negative correlation; coincidence D. Positive correlation; direct cause
Find the x- and y-intercepts of the graph.
A. (-4, 0), (0, 5) B. (4, 0), (0, 5) C. (4, 0), (0, -5) D. (5, 0), (0, 4)
Use a graphing calculator to solve the linear equation.The graph of y1 is shown in the standard viewing window. Which is the only choice that could possibly be the solution of the equation y1 = 0?
-5, 5, 
, 15
A. -5
B. 
C. 15
D. 5
Provide the proper response.Discuss the graph of the equation 
+ 
= 1 if a = b.
What will be an ideal response?