Find the quotient and simplify.
÷ 
A. (x + y)
B. (x - y)(x + y)
C. (x + y)2
D. (x - y)2
Answer: D
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Find the mean. Round to the nearest tenth unless otherwise stated.Grocery expenses for the past six months: 
, 
, 
, 
, 
, 
/>.Round to the nearest cent. A. $60.60 B. $72.60 C. $90.76 D. $60.50
Solve the problem.Suppose a cost-benefit model is given by 
where C is the cost in thousands of dollars for removing p percent of a given pollutant. Find C(90) to the nearest dollar and interpret it.
A. $52,200; It will cost $52,200 to remove 90% of the pollutant. B. $5800; It will cost $5800 to remove 0.90% of the pollutant. C. $5220; It will cost $5220 to remove 0.90% of the pollutant. D. $9000; It will cost $9000 to remove 90% of the pollutant.
Use a graphing calculator to sketch the graph of the quadratic equation, and then state the domain and range.y = -2x2 + 6x - 5
A. D: (x ? 1.5), R: (y ? -5) B. D: (x ? 1.5), R: all real numbers C. D: all real numbers; R: (y ? -0.5) D. D: all real numbers; R: (y ? -0.5)
The Richter scale converts seismographic readings into numbers for measuring the magnitude of an earthquake according to this function M(x) = log 
, where xo = 10-3.What is the magnitude of an earthquake whose seismographic reading is 7.6 millimeters at a distance of 100 kilometers from its epicenter?
A. 3.8808 B. 0.20281 C. 0.38808 D. 2.0281