Graph the solution set of the system of inequalities.y ? - x2 - 6x - 4y ? x2 + 6x + 4
A. 
B. 
C. 
D. 
Answer: D
Mathematics
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Find the exact value by using a half-angle identity.sin 22.5°
A. 
B. - 
C. 
D. - 
Mathematics
A map uses a scale of 1 centimeter for each 5 kilometers. If the distance on the map from city A to city B is 17.5 cm, what is the actual distance between the cities in km? In miles? (Remember that there are 2.54 cm in one inch and 5280 feet in one mile.)
What will be an ideal response?
Mathematics
Use the information given about the angle ?, 0 ? ? ? 2?, to find the exact value of the indicated trigonometric function.sec ? = 4, 0 < ? < 
Find cos 
.
A. 
B. 
C. 
D. 
Mathematics
Multiply. Write your answer in a + bi form.(7 - 4i)(9 + 4i)
A. 47 - 64i B. -16i2 - 8i + 63 C. 79 + 8i D. 79 - 8i
Mathematics