Find the value of the determinant.
A. -90
B. 90
C. -50
D. 85
Answer: B
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Factor the polynomial completely using the trial and error method.15x2 + 4xy - 4y2
A. (15x + 2y)(x - 2y) B. prime C. (3x - 2y)(5x + 2y) D. (3x + 2y)(5x - 2y)
The letters x and y represent rectangular coordinates. Write the equation using polar coordinates (r, ?).2x + 3y = 6
A. 2 sin ? + 3 cos ? = 6r B. r(2 cos ? + 3 sin ?) = 6 C. 2 cos ? + 3 sin ? = 6r D. r(2 sin ? + 3 cos ?) = 6
?Boat docking. Suppose that a boat is being pulled toward a dock by a winch that is 24 ft above the level of the boat deck. If the winch is pulling the cable at a rate of 13 
, at what rate is the boat approaching the dock when it is 32 ft from the dock? Use the figure below.
?
?
A. 16.25?
B. 13?
C. ?21.67
D. ?9.75
E. ?7.8
Find the matrix product, if possible.
A. 
B. 
C. 
D. 