Write the product as a sum. cos 7x cos 3x.
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(c) [cos 10x +cos 4x] / 2
Mathematics
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The following circle graph displays Chris and Mary Smith's monthly $2900 family budget. Use the circle graph to answer the question. 
What is the ratio of money spent on transportation to the total amount of the monthly budget?
A. 
B. 
C. 
D. 
Mathematics
Answer the question.Which feature of the textbook always follows the title of a section in the textbook?
A. Readiness Quiz B. Work Smart C. Quick Check D. Examples
Mathematics
Solve the equation.7x + 15 = 2x + 25
A. {-2} B. {2} C. {5} D. {-5}
Mathematics
Graph the system of inequalities.(x + 2)2 + (y - 4)2 ? 9 (x - 2)2 + (y - 4)2 ? 9
A. 
B. 
C. 
D. 
Mathematics