Complete the identity.sin ? [sin (5?) + sin (7?)] = ?
A. cos ? [cos (5?) - cos (7?)]
B. 
cos ? [cos (5?) + cos (7?)]
C. cos ? [cos (5?) + cos (7?)]
D. 
cos ? [cos (5?) - cos (7?)]
Answer: A
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Express the number in scientific notation.In a certain city, the subway system carried a total of 1,740,000,000 passengers.
A. 17.4 × 109 B. 1.74 × 109 C. 1.74 × 108 D. 1.74 × 1010
Factor completely. If the polynomial is prime, so state.5x2 + 56x + 11
A. (5x + 11)(x + 1) B. (5x + 1)(x + 11) C. (5x - 1)(x - 11) D. prime
The ? shape in the figure below is shown using 9 pixels in a 3 × 3 grid. The color levels are given to the right of the figure. Use the matrix 
that represents a digital photograph of the ? shape to solve the problem.
Adjust the contrast by leaving the black alone and changing the light grey to dark grey. Use matrix addition to accomplish this.
A. 
+ 
= 
B. 
+ 
= 
C. 
+ 
= 
D. 
+ 
= 
Find the zeros of the polynomial function and state the multiplicity of each.f(x) = x3 + 7x2 - x - 7
A. -7, multiplicity 2; 1, multiplicity 1 B. -7, multiplicity 1; -1, multiplicity 2 C. -7, multiplicity 1; -1, multiplicity 1; 1, multiplicity 1 D. -1, multiplicity 1; 1, multiplicity 1; 7, multiplicity 1