Solve.On the morning of December 19 the temperature was -6°F. The next morning the temperature had risen 12°F. What was the temperature on the morning of December 20?
A. 18°F
B. -18°F
C. -6°F
D. 6°F
Answer: D
Mathematics
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Use formulas to find the area of the plane region.
A. 32 mi2 B. 16 mi2 C. 64 mi2 D. 12 mi2
Mathematics
Find the area of the specified region.Shared by the circle r = 8 and the cardioid r = 8(1 + sin ?)
A. 64 B. 16(5? + 8) C. 0 D. 16(5? - 8)
Mathematics
Solve the problem.In a school survey, students showed these preferences for instructional materials. Answer the question. 
About how many students would you expect to prefer written materials in a school of 900 students?
A. About 162 students B. About 9 students C. About 81 students D. About 324 students
Mathematics
Find the focus and the directrix of the parabola.y = - 
x2 + 
x - 
A. (2, -3); y = 1
B. (2, -9); y = -7
C. 
; y = - 
D. (2, 1); y = -3
Mathematics