Solve the problem.Evaluate 
by transforming to cylindrical or spherical coordinates.
A. 
B. 
C. 
D. 
Answer: A
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?What is the best reason for lining up the decimal point when adding or subtracting decimal numbers? ?
A. ?In order to line-up the place-values of each digit. B. ?In order to line-up the decimal point. C. ?In order to follow the procedure of the addition/subtraction algorithm. D. ?You cannot perform the operation otherwise. E. ?So you can annex zeros when necessary.
Find the square root. If it is not a real number, say so.
A. 14 B. 9 C. 7 D. 2401
A contractor finds a bill for $1,210 for 520 ceiling tiles. She knows that there were two types of tiles used; one selling at $2.00 a tile and the other at $3.00 a tile. How many of each type were used?
A. 170 tiles of the first type were used, 350 tiles of the second were used. B. 340 tiles of the first type were used, 130 tiles of the second were used. C. 350 tiles of the first type were used, 170 tiles of the second were used. D. 350 tiles of the first type were used, 120 tiles of the second were used. E. 350 tiles of the first type were used, 140 tiles of the second were used.
Find the product.(x + 11)(x - 11)
A. x2 - 121 B. x2 - 22x - 121 C. x2 - 22 D. x2 + 22x - 121