Use the properties of the trigonometric functions to find the exact value of the expression. Do not use a calculator.sec2 70° - tan2 70°
A. -1
B. 0
C. 2
D. 1
Answer: D
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Find the intervals on which the function is increasing and the intervals on which the function is decreasing.f(x) = x2 - 8x - 20
A. Increasing on (4, ?); decreasing on (-?, 4) B. Increasing on (- 4, ?); decreasing on (-?, - 4) C. Increasing on (-?, - 4); decreasing on (- 4, ?) D. Increasing on (-?, 4); decreasing on (4, ?)
Round the whole number to the given place.In 2005, a company spent $493,749,725 on television advertising. Round this amount to the nearest hundred-million.
A. $400,000,000 B. $500,000,000 C. $493,700,000 D. $493,800,000
Write an equation of the line through the given point with the given slope. Write the equation in slope-intercept form.(-8, -2), m = 
A. y = 
x - 2
B. y = 2x + 2
C. y = - 
x + 2
D. y = 
x + 2
Find the vertices of the hyperbola. : 16y² - 4x² = 64
What will be an ideal response?