Find the exact value of the expression if ? = 45°. Do not use a calculator.f(?) = sin ?Find 
.
A. 
B. 12
C. 
D. 
Answer: A
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If the equation represents a hyperbola, find the center, foci, and asymptotes. If the equation represents an ellipse, find the center, vertices, and foci. If the equation represents a circle, find the center and radius. If the equation represents a parabola, find the focus and directrix. y2 - x2 - 4y + 10x - 57 = 0
A. C: (5, 2); F: (0, 2 + 6
), (0, 2 - 6
); A: y - 2 = x - 5, y - 2 = -(x - 5)
B. C: (5, -4); F: (6
, 0), (- 6
, 0); A: y =
x, y = - 
x
C. C: (5, 2); F: (5, 2 + 6
), (5, 2 - 6
); A: y - 2 = x - 5, y - 2 = -(x - 5)
D. C: (-1, 2); F: (6
, 0), (- 6
, 0); A: y = x, y = -x
Solve the problem.Mario saved 0.8 of what he earned over the summer. Write this decimal as a percent.
A. 0.8% B. 80% C. 0.08% D. 800%
Solve the problem.The function f computes the annual interest paid on savings of x dollars with an interest rate of 8%. The graph of f and the horizontal line 
are shown in the figure. Determine the x-values that satisfy (i) the equation f(x) = 3.36 and (ii) the equation f(x) > 3.36. Express your answers symbolically. 
A. {x|x = 42}; {x|x > 42} B. {x|x = 42}; {x|x ? 42} C. {x|x < 42}; {x|x > 42} D. {x|x < 42}; {x|x ? 42}
Solve the polynomial equation graphically or numerically. Round to the nearest hundredth if necessary.x3 - 75x - 250 = 0
A. 5, -5, 10 B. -5, 5, 10 C. -5, -5, 10 D. -10, -5, 5