Use the reference angle to find the exact value of the expression. Do not use a calculator.cot 570°
A. 
B. -
C. - 
D. 
Answer: D
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Find T, N, and B for the given space curve.r(t) = (cosh t)i + (sinh t)j + tk
A. T = - 
(tanh t)i + 
j + 
(sech t)k; N = (-sech t)i - (sinh t)k ; 
B. T = 
(tanh t)i + 
j + 
(sech t)k; N = (sech t)i - (tanh t)k; 
C. T = - 
(tanh t sech t)i + 
j + 
(sech t)k; N = (-sech t)i - (tanh t)k; 
D. T = 
(tanh t sech t)i + 
j + 
(sech t)k; N = (sech2 t)i - (sinh t)k; 
Simplify the rational expression. Find all numbers that must be excluded from the domain of the simplified rational expression.
A. 7x - 3, x ? 5
B. 7x2 - 41, no restrictions on x
C. 
, x ? 5
D. 
, x ? 5
Solve the problem.A street sign prohibits vehicles over 2.5 tons from entering a certain street. How many pounds is that?
A. 5000 pounds B. 13,200 pounds C. 2500 pounds D. 4400 pounds
Find an equation of a parabola satisfying the given conditions.Focus at (-5, 8), directrix x = -3
A. (x + 8)2 = -4(y + 4) B. (y + 8)2 = -4(x + 4) C. (x - 8)2 = -4(y + 4) D. (y - 8)2 = -4(x + 4)