Solve the problem.The quadratic function 
models the median, or average, age, y, at which U.S. men were first married x years after 1900. In which year was this average age at a minimum? (Round to the nearest year.) What was the average age at first marriage for that year? (Round to the nearest tenth.)
A. 1956, 48.8 years old
B. 1956, 24 years old
C. 1952, 36 years old
D. 1936, 48.8 years old
Answer: B
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Evaluate the integral.
A. 7 csch x2 + C
B. 
+ C
C. - 
sech x2 + C
D. 
sech x2 + C
The scores on a 30-point multiple-choice exam are given in the following frequency table:
The range on the exam is
A. 7. B. 10. C. 9. D. 8. E. none of these
Solve.For a fixed amount of principal, the simple interest varies jointly with the rate and the time. If the simple interest is $1750 when the rate is 5% and the time is 7 years, find the simple interest when the rate is 6% and the time is 10 years.
A. $6000 B. $300 C. $3300 D. $3000
Answer the question.The code for some garage door openers consists of 12 electrical switches that can be set to "+" , "0" , or "-" by the owner. With this type of opener, how many different codes are possible?
A. 531,193 B. 530,241 C. 532,701 D. 531,441