Solve the problem.The area of a square is 81 square centimeters. If the same amount is added to one dimension and removed from the other, the resulting rectangle has an area 9 square centimeters less than the area of the square. How much is added and subtracted?
A. 12 cm
B. 3 cm
C. 4 cm
D. 9 cm
Answer: B
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Find the natural domain of the function.f(x, y) = cos-1(x2 + y2)
A. All points in the x-y plane satisfying x2 + y2 ? 1 B. All points in the x-y plane C. All points in the x-y plane satisfying x2 + y2 ? 1 D. All points in the x-y plane except (0, 0)
Use the FOIL method to find the products.(x + 6)(5x - 5)
A. 5x2 - 30x + 25 B. 5x2 + 23x - 30 C. 5x2 + 25x - 30 D. 5x2 + 25x + 25
Explain the answer in terms of the appropriate property of real numbers or definition.You calculate the area of a triangle using the product 
? 6 ? 14. Your friend calculates the area of the same triangle using the product 
? 14 ? 6. Are both calculations correct?
What will be an ideal response?
Perform the indicated operation. Assume that all variables are nonnegative.8
+ 
- 7
A. 
+ 
B. 
C. 15
+ 
D. 