Find the cofactor of the indicated element of the matrix shown.a21;
A. -10
B. 11
C. -11
D. 10
Answer: B
Mathematics
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Find the focus and directrix of the parabola.y2 - 20x = 0
A. F: (5, 0); D: y = -5 B. F: (5, 0); D: x = -5 C. F: (0, 5); D: y = -5 D. F: (5, 0); D: x = 5
Mathematics
Write a formula for a linear function f whose graph satisfies the conditions.Slope: - 
; y-intercept: 8
A. f(x) = - 
x - 8
B. f(x) = - 
x + 8
C. f(x) = 
x - 8
D. f(x) = 
x + 8
Mathematics
Round as indicated.8.778 to the nearest tenth
A. 8.7 B. 8.8 C. 8.9
Mathematics
Find the product AB.A = 
, B = 
A. 
B. 
C. 
D.
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Mathematics