The percent of mothers who work outside the home and have children younger than age 6 yr is approximated by the function 
where t is measured in years, with 
corresponding to the beginning of 1980.
?
Compute 
. Round your answer to six decimal places.
?
A. 
per year in the second power
B. 
per year in the second power
C. 
per year in the second power
D. 
per year in the second power
E. 
per year in the second power
Answer: D
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Find the exact value of the indicated trigonometric function of ?, if ? is an angle in standard position whose terminal side contains the given point.
; find sin ? and cos ?.
A. sin ? = - 
, cos ? = 
B. sin ? = - 
, cos ? = - 
C. sin ? = 
, cos ? = - 
D. sin ? = 
, cos ? = - 
Add or subtract as indicated. Write your answer in the form a + bi.(-5 + 2i) - 3
A. -8 + 2i B. -2 - 2i C. -2 + 2i D. 8 - 2i
Fill in the blank with one of the words or phrases listed below. 
Two angles that have a sum of 90° are called 
angles.
A. complementary B. supplementary C. acute D. straight
Determine whether the statement is true or false. ?A sequence with terms has n-1 second differences. ?
A. False B. True