Subtract.(3.9x3 - 7.7x2 - 3) - (8.1x3 - 2.3x2 + 1)
A. -4.2x3 - 5.4x2 - 4
B. -4.2x3 - 10x2 - 4
C. 12x3 - 5.4x2 - 4
D. -4.2x3 - 5.4x2 + 4
Answer: A
Mathematics
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Use the Half-angle Formulas to find the exact value of the trigonometric function. cos 22.5°
A. - 
B. 
C. - 
D. 
Mathematics
Graph the function.f(x) = - 
log5x
A. 
B. 
C. 
D. 
Mathematics
Find the focus and the directrix of the parabola.x = 2y2 + 8y + 5
A. 
; x = - 
B. 
; x = - 
C. (-1, -3); x = -5
D. (-5, -3); x = -7
Mathematics
Find the derivative of the function.f(x) = (4x - 6)(4x + 1)
A. f'(x) = 16x - 20 B. f'(x) = 32x - 28 C. f'(x) = 32x - 20 D. f'(x) = 32x - 10
Mathematics