Solve the problem.Refer to the figure, where f(t) is the interest rate (as a percent) on a 6-month certificate of deposit t years after January 1, 1985. The straight lines are tangent to the graph of 
at 
and 
How fast was the interest rate changing on January 1, 1995?
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A. ? -2%/year
B. ? 0%/year
C. ? 2%/year
D. ? 1%/year
Answer: D
Mathematics
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A. ? -2%/year
B. ? 0%/year
C. ? 2%/year
D. ? 1%/year
Answer: D
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Solve the problem.A sample of 350 grams of radioactive substance decays according to the function 
where t is the time in years. How much of the substance will be left in the sample after 40 years? Round to the nearest whole gram.
A. 951 grams B. 0 grams C. 129 grams D. 1 gram
Solve the equation.
- 2 = 
- 3
A. 
B. 
C. 
D. 
Solve the problem.George Higgendorf sells used books. He had start-up costs of $2000 and pays $3.00 for each book. He sells each book for $6.25. Express the revenue R as a function of x, where x represents the number of books sold.
A. R(x) = 9.25x B. R(x) = 3.00x C. R(x) = 6.25x D. R(x) = 2000x
Find 
if the universal set 
.
?
, 
?
A. 
B. 
C. 
D. 
E. 