Use identities to write each expression as a function of ?.cos 
A. -cos ?
B. -sin ?
C. cos ?
D. sin ?
Answer: B
Mathematics
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Provide an appropriate response.Sonja plans to save 1/10 of her salary each week, which is $350. To solve this problem use:
A. division B. subtraction C. addition D. multiplication
Mathematics
Solve the system mentally, without the use of a calculator or pencil-and-paper calculation. Try to visualize the graphs of both lines.x - 0y = 53x + y = 7
A. x = -5; y = 8 B. x = 5; y = -8 C. x = 3, y = 7 D. x = 5; y = 4
Mathematics
Simplify the expression. Assume that all variables represent nonnegative numbers.2
+ 3
- 
A. 5
B. 10
C. 7
D. 9
Mathematics
Find the common difference, d, for the arithmetic sequence.6, 9, 12, 15, . . .
A. 9 B. 6 C. 3 D. 15
Mathematics