Graph the ellipse, centered at the origin, satisfying the conditions.Foci at (±3, 0),vertices (±6, 0)
A. 
B. 
C. 
D. 
Answer: D
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Write an equivalent double integral with the order of integration reversed.
A. 
B. 
C. 
D. 
Let C (t) be the total value of US currency (coins and banknotes) in circulation at time. The table gives values of this function from 1980 to 2000, as of September 30, in billions of dollars. Estimate the value of C (1990) .
Answers are in billions of dollars per year. Round your answer to two decimal places.
The graphing calculator screens show a system and the point of intersection. Choose the screen which best represents the given system.y = 2x - 9y = -2x + 3
A. 
B. 
C. 
D. 
If P dollars are invested at the end of each year in an annuity that earns interest at an annual rate r, the amount in the account will be A dollars after n years, where
?
?
If $2,900 is invested each year in an annuity earning 8% annual interest, when will the account be worth $45,000?
?
Please enter your answer as a number without the units, rounded to one decimal place.
Fill in the blank(s) with the appropriate word(s).