Solve.
= 
A. 30
B. 
C. 
D. 
Answer: B
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Solve the system of equations using substitution.
A. x = -5, y = -1; x = 8, y = 
or (-5, -1), 
B. x = 5, y = 1; x = -8, y = - 
or (5, 1), 
C. x = 5, y = 1; x = - 
, y = -8
or (5, 1), 
D. x = -5, y = -1; x = 
, y = 8
or (-5, -1), 
Solve the problem.If a ladder is carried horizontally around a corner from a hall A feet wide into a hall B feet wide, the length of the longest ladder that can turn the corner can be determined by first solving the equation 
Solve this equation for ?.
A. ? = tan-1 
B. ? = tan-1 
C. ? = tan-1 
D. ? = tan-1 
Give the genus of the object. If the object has a genus larger than 5, write "larger than 5."A kitchen chair
A. genus 3 B. genus 4 C. larger than 5 D. genus 5
Establish the identity.cot(x + y) cot(x - y) = 
What will be an ideal response?