Solve the problem.The life expectancy of a car battery is normally distributed. The average (mean) lifetime is 235 weeks with a standard deviation of 15 weeks. If the company guarantees the battery for 4 years, what percentage of the batteries sold would be expected to be returned before the end of the warranty period?
A. 0.0359
B. 0.9281
C. 0.9641
D. 0.0719
Answer: A
Mathematics
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Mathematics
Decide whether or not the equation has a circle as its graph. If it does not, describe the graph.5x2 + 5y2 + 40x - 30y + 120 = 0
A. no; the graph is nonexistent B. yes C. no; the graph is the point (4, -3) D. no; the graph is the point (-4, 3)
Mathematics
Without using a calculator, give the exact trigonometric function value with rational denominator.cos 60°
A. 
B. 
C. 
D. 
Mathematics
Find the perimeter.A concrete curb is to be built around a parking lot. How many meters of curbing will be needed?
A. 243 m B. 290 m C. 145 m D. 4606 m
Mathematics