Use the graph of the function f(x) to locate the local extrema and identify the intervals where the function is concave up and concave down.
A. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (-?, -3) and (3, ?); concave down on (-3, 3)
B. Local minimum at x = 3 ; local maximum at x = -3 ; concave up on (0, ?); concave down on (-?, 0)
C. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (0, ?); concave up on (-?, 0)
D. Local minimum at x = 3 ; local maximum at x = -3 ; concave down on (-?, -3) and (3, ?); concave up on (-3, 3)
Answer: B
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Solve the equation on the interval 0 ? ? < 2?.cos ? = sin ?
A. 
B. 
C. 
D. 
Find the area of the region under the graph of the function
?
?
on the interval 
.
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Find an equation of the hyperbola centered at the origin which satisfies the given conditions.A hyperbola with vertices (±4, 0) and foci (±7, 0)
A. 
- 
= 1
B. 
- 
= 1
C. 
- 
= 1
D. 
- 
= 1
The sizes of two matrices are given. Find the size of the product AB and the size of the product BA, if the given product can be calculated.A is 2 × 4; B is 4 × 2.
A. AB is 2 × 2; BA cannot be calculated. B. AB cannot be calculated; BA is 4 × 4. C. AB is 4 × 4; BA is 2 × 2. D. AB is 2 × 2; BA is 4 × 4.