Perform the indicated operation and simplify.
- 
A. 
B. 11
C. 
D. 
Answer: D
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Use a sum-to-product identity to rewrite the expression.cos 
- cos 
A. 2
B. - 2
C. 2
D. -2
Solve using matrices.A chemist has prepared two acid solutions, one which is 6% acid by volume and the other which is 10% acid. How many cubic centimeters of each should the chemist mix together to obtain 50 cm3 of 
-acid solution?
A. 6%-solution: 3.76 cm3; 10%-solution: 46.24 cm3 B. 6%-solution: 46.24 cm3; 10%-solution: 3.76 cm3 C. 6%-solution: 25 cm3; 10%-solution: 25 cm3 D. 6%-solution: 31 cm3; 10%-solution: 19 cm3
Use technology to compute r, the correlation coefficient.The following are costs of advertising (in thousands of dollars) and the number of products sold (in thousands): 
A. .6756 B. -.3707 C. .6112 D. .2635
Determine whether the given value is a solution to the given equation.Is 0.07 a solution of -7.9x = -5.53?
A. Yes B. No