Add or subtract, as indicated. Assume that all variables represent positive real numbers.7x
- 9x
A. 2x
B. -2x
C. -2x
D. -2
Answer: B
Mathematics
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Solve the problem.Find parametric equations for the normal line to the surface 
at the point 
A. 
B. 
C. 
D. 
Mathematics
Find the area of the specified region.Shared by the cardioids r = 8(1 + sin ?) and r = 8(1 - sin ?)
A. 32(3? + 8) B. 16(5? + 8) C. 32(3? - 8) D. 1664
Mathematics
Graph the function.f(x) = -4x2
A. 
B. 
C. 
D. 
Mathematics
Solve. Round your answer to the nearest tenth, if necessary.The length of a rectangular storage room is 5 feet longer than its width. If the area of the room is 50 square feet, find its dimensions.
A. Width is 4 feet; length is 11 feet B. Width is 5 feet; length is 10 feet C. Width is 6 feet; length is 11 feet D. Width is 4 feet; length is 9 feet
Mathematics