Solve the problem.The temperature of water in a certain lake on a day in October can be determined by using the model 
where x is the number of feet down from the surface of the lake and y is the Celsius temperature of the water at that depth. Based on this model, how deep in the lake is the water 13 degrees? (Round to the nearest foot.)
A. 53 feet
B. 23 feet
C. 60 feet
D. 4 feet
Answer: D
Mathematics
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Find the radius of convergence of the power series.
A. 5 B. 0 C. ? D. 10
Mathematics
Solve the problem.In 1984, the life expectancy for a female born in the United States was 75.7 years and was increasing at a rate of 0.25 years per year. Assume that this rate of increase remains constant. Using an appropriate linear equation as a model, estimate the life expectancy of a female born in the U.S. in 1998.
A. 80.20 years B. 79.20 years C. 89.20 years D. 3.50 years
Mathematics
Solve the equation.2a = -14
A. -7 B. 16 C. -16 D. 1
Mathematics
Decide whether the pair of lines is parallel, perpendicular, or neither.3x - 9y = 16 27x + 12y = 16
A. parallel B. perpendicular C. neither
Mathematics