Simplify. Assume that all variables represent positive real numbers.
- 
+ 
A. 
B. 
C. - 
D. 
Answer: D
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Complete the identity.1 - cos(2?) + cos(6?) - cos(8?) = ?
A. 4 sin ? sin(3?) sin(4?) B. 4 cos ? cos(3?) sin(4?) C. 4 cos ? cos(3?) cos(4?) D. 4 sin ? cos(3?) sin(4?)
Find the product.(-4x4y4)(-4x3y2)
A. 16x6y7 B. 16xy6 C. 16xy7 D. 16x7y6
Find a matrix A and a column matrix B that describe the following tables involving credits and tuition costs. Find the matrix product AB, and interpret the significance of the entries of this product.
?
A.
AB = 
Tuition for Student 1 is $940, tuition for Student 2 is $810, and tuition for Student 3 is $650.
B.
AB = 
The number of credits for Student 1 is 12, the number of credits for Student 2 is 15, and the number of credits for Student 3 is 12.
C.
AB =
Tuition for Student 1 is $840, tuition for Student 2 is $660, and tuition for Student 3 is $900.
D.
AB = 
The number of credits for Student 1 is 12, the number of credits for Student 2 is 17, and the number of credits for Student 3 is 15.
Use the information given in the figure.
How many are in A or B or C?
A. 5 B. 101 C. 14 D. 89