Find the missing expression.
+ 
= 
A. 11x - 8
B. 21x + 8
C. 11x + 8
D. 21x + 6
Answer: C
Mathematics
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Use the appropriate sum or difference identity to write the given expression as a function of x alone.cos (270° - x)
A. - sin x B. cos x C. sin x D. - cos x
Mathematics
Provide an appropriate response.Solve the rational inequality: 
> 0
A. 0 < x < 5 B. x < 0 or x > 5 C. x < -5 or x > 0 D. x = 0 or x = 5
Mathematics
Answer the question.Choose the expression that is equivalent to the following: 1(9y3)
A. 9y3 B. 10y3 C. 1 D. 9y4
Mathematics
Solve.Find the missing length in the right triangle shown below. 
A. 9
B. 
C. 12
D. 3
Mathematics