Solve the system by the elimination method. x - 3y = 16-4x - 4y = 16
A. {(0, -4)}
B. {(-1, -4)}
C. {(1, -5)}
D. ?
Answer: C
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Use the appropriate formula to find the indicated figurate number.the 18th heptagonal number
A. Hp18 = 837 B. Hp18 = 37.8 C. Hp18 = 783 D. Hp18 = 810
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.
Using the same color levels from the instructions, write a 3 × 3 matrix A that represents the letter L in dark grey on a white background. Then find a 3 × 3 matrix B so that A + B lightens only the letter L from dark grey to light grey.
A.
A = 
; B = 
B.
A = 
; B = 
C.
A = 
; B = 
D.
A = 
; B = 
Find the perimeter of the geometric figure.
A. 16k2 + 24x B. 8k2 + 6x + 6 C. 8k2 + 12x D. 16k2 + 12x + 12
Find the greatest common factor of the list of terms.y6, y4, y8
A. y10 B. y6 C. y4 D. y8