Find the exact value by using a half-angle identity.sin 
A. 
B. 
C. 
D. 
Answer: C
Mathematics
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Find the indicated angle or side. Give an exact answer.Find the exact length of side a.
A. 9
B. 7
C. 
D. 
Mathematics
Find the given value.Find (f ? g)(4) when f(x) = x - 2 and g(x) = -4x2 + 12x - 4.
A. -40 B. -120 C. 120 D. -408
Mathematics
Give three kinds of notation for the percent.78.2%
A. 
; 78 × 
; 78 × 0.01
B. 
; 78.2 × 
; 78.2 × 0.001
C. 
; 78.2 × 
; 78.2 × 0.01
D. 
; 78.2 × 
; 78.2 × 0.1
Mathematics
Solve.The roof of a building is in the shape of the hyperbola 
where x and y are in meters. Refer to the figure and determine the height h of the outside walls.A = 8 m
A. 11.1 m B. 51 m C. 123 m D. 5 m
Mathematics