Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = -2x2 + 7x + 8
A. Increasing on 
; decreasing on 
B. Increasing on 
; decreasing on 
C. Increasing on (-?, 0); decreasing on ( 0, ?)
D. Increasing on (-?, 1); decreasing on ( -1, ?)
Answer: A
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Find the vertex, focus, and directrix of the parabola. Graph the equation.x2 = 8y
A. vertex: (0, 0)
focus: (-2, 0)
directrix: x = 2
B. vertex: (0, 0)
focus: (0, -2)
directrix: y = 2
C. vertex: (0, 0)
focus: (2, 0)
directrix: x = -2
D. vertex: (0, 0)
focus: (0, 2)
directrix: y = -2
Find the indicated matrix product or state that the product is undefined.A = 
, B = 
AB
A. 
B. 
C. 
D. 
Use an identity to write the expression as a single trigonometric function or as a single number.± 
A. cos 15? B. sin 15? C. cos 60? D. sin 60?
Write the number in scientific notation.54,000,000
A. 5.4 × 10-8 B. 5.4 × 107 C. 5.4 × 108 D. 5.4 × 10-7