Use logarithmic identities to complete the following. Write 4ln (x - 2) - 5 ln x as a single logarithm.
A. ln 
B. ln x5(x - 2)4
C. ln 20x(x - 2)
D. ln 
Answer: D
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Solve the problem.In 9 weeks, the value of Bob Treatman's day trading account decreased by $207. What was the average weekly change in the value of the account?
A. -$29 per week B. $21 per week C. -$25 per week D. -$23 per week
Solve the system by the elimination method. 7x + 8y = 67 3x + 6y = 39
A. {(4, 5)} B. {(5, 5)} C. {(5, 4)} D. ?
Solve the equation.x(x - 20) = -100
A. {10, -10} B. {10} C. {20} D. {-10}
A contractor needs to grade the slope of a subdivision lot to place a house on level ground. (See the illustration.) The present slope of the lot is 10.5°. The contractor needs a level lot that is 106 ft deep. To control erosion, the back of the lot must be cut to a slope of 23.2°. How far from the street, measured along the present slope, will the excavation extend? Round your answer to the nearest foot.
A. 184 ft B. 190 ft C. 196 ft D. 168 ft E. 210 ft