Solve the problem.You have $50,000 and wish to invest part at 10% and the rest at 6%. How much should be invested at each rate to produce the same return as if it all had been invested at 9%?
A. $37,500 at 6%, $12,500 at 10%
B. $37,000 at 10%, $13,000 at 6%
C. $37,000 at 6%, $13,000 at 10%
D. $37,500 at 10%, $12,500 at 6%
Answer: D
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Find the value of d2y/dx2 at the point defined by the given value of t.x = tan t, y = 7 sec t, t = 
A. - 
B. 7
C. 
D. - 
Solve the initial value problem.
= csc x, y(2) = -9
A. y = 
- 9
B. y = 
+ 2
C. y = -
- 9
D. y = 
- 9
Solve the problem.Find the equation of the line which contains P(1, 5) and which is perpendicular to the x-axis.
A. x = 1 B. y = 5 C. y = 1 D. x = 5
Solve.The polynomial 
models natural gas consumption in billions of cubic feet for a certain country during year x, where 
corresponds to 1990, 
to 1991, and so on. Approximately how much gas will be consumed in 2025?
A. 273.1 billion ft3 B. 124.1 billion ft3 C. 347.1 billion ft3 D. 50.1 billion ft3