Use the given values of the variables to find the value of the expression.
for x = 3, y = -7
A. 85
B. 6
C. -55
D. 55
Answer: C
Mathematics
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Find all specified roots.Sixth roots of i.
A. cis 
, cis 
, cis 
, cis 
, cis 
, 
B. cis 
, cis 
, cis 
, cis 
, cis 
, 1
C. cis 
, cis 
, cis 
, cis 
, i
D. cis 
, cis 
, cis 
, cis 
Mathematics
Simplify.(5 + 
)2
A. 28 + 
B. 28 + 10
C. 25 - 
D. 28 - 10
Mathematics
Solve the problem.A formula for calculating the distance, d, one can see from an airplane to the horizon on a clear day is 
where x is the altitude of the plane in feet and d is given in miles. How far can one see in a plane flying at 27,000 feet? Round your answer to the nearest tenth mile, if necessary.
A. 16,470 mi B. 1647 mi C. 181.5 mi D. 200.5 mi
Mathematics
Convert the angle from degrees to radians. Express the answer as a multiple of ?.-30°
A. - 
B. - 
C. - 
D. - 
Mathematics