Simplify the expression. Assume that all variables are positive when they appear.
- 5
+ 2
A. -3x
B. -3x
C. -17x
D. -17x
Answer: C
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MonthWhat were the total sales for the first 6 months of 2010?
A. $64,000 B. $366,000 C. $286,000 D. $302,000
Solve the problem.Tides go up and down in a 12.8-hour period. The average depth of a certain river is 8 m and ranges from 5 to 11 m. The variation can be approximated by a sine curve. Write an equation that gives the approximate variation y, if x is the number of hours after midnight and high tide occurs at 10:00 am.
A. y = 8 sin 
+ 3
B. y = 8 sin 
+ 3
C. y = 3 sin 
+ 8
D. y = 3 sin 
+ 8
Complete the identity.tan4 ? - sec4 ? = ?
A. sec2 ? B. tan 2 ? - sec2 ? C. -2 tan2 ? - 1 D. sec2 ? + tan2 ?
Write the expression in the standard form a + bi.(8 + 9i)(3 - 4i)
A. 60 + 5i B. -36i2 - 5i + 24 C. 60 - 5i D. -12 + 59i