Solve the equation by completing the square.x2 - 8x - 7 = 0
A. {8 - 
, 8 + 
}
B. {4 - 
, 4 + 
}
C. {-4 - 
, -4 + 
}
D. {4 - 
, 4 + 
}
Answer: D
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Write an equivalent double integral with the order of integration reversed.
A. 
B. 
C. 
D. 
Solve the problem.A balloon is secured to rope that is staked to the ground. A breeze blows the balloon so that the rope is taut while the balloon is directly above a flag pole that is 40 feet from where the rope is staked down. Find the altitude of the balloon if the rope is 70 feet long.
A. 
ft
B. 10
ft
C. 
ft
D. 10
ft
Find zw or 
as specified. Leave your answer in polar form.z = 5(cos 200° + i sin 200°)w = 4(cos 50° + i sin 50°)Find 
.
A. 
(cos 40° + i sin 40°)
B. 
(cos 40° + i sin 40°)
C. 
(cos 150° + i sin 150°)
D. 
(cos 150° + i sin 150°)
Find the indicated trigonometric function for ?, given that ? is an angle in standard position with the terminal side defined by the given point.(-10, -24); find cos ?
A. 
B. - 
C. - 
D. - 