Find the indicated intersection or union.{4, 9, 13, 15} ? {9, 15, 20, 28}
A. {4, 9, 15, 20}
B. {9, 15, 20}
C. {9, 15}
D. {4, 9, 13, 15, 20, 28}
Answer: D
Mathematics
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Use a negative-angle identity to write an equivalent trigonometric expression involving a positive angle.tan 
A. -tan 
B. 1 - tan 
C. cot 
D. tan 
Mathematics
Complete the identity.
= ?
A. 2 sin (14?) B. 2 sin (7?) sin (3?) C. 2 cos (7?) sin (3?) D. tan (7?)
Mathematics
Rationalize the denominator. Write the quotient in lowest terms.
A. 
B. 
C. 
D. 
Mathematics
Simplify the expression. If the expression cannot be simplified, so state.8(y + 7) - 5
A. 8y + 16 B. 8y + 51 C. 8y + 2 D. 15y - 5
Mathematics