Solve the equation.
- 
= 1
A. {1}
B. 
C. 
D. 
Answer: A
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Find the equation of an ellipse that contains the following points.(-1, 6), (-1, -4), (7, 1), (-9, 1)
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Write the given number in scientific notation.37.73
A. 3.773 × 102 B. 3.773 × 10-1 C. 3.773 × 101 D. 3.773 × 10-2
Transform the polar equation to an equation in rectangular coordinates. Then identify and graph the equation.r sec ? = -6
A. y = -6; horizontal line 6 units
below the pole
B. x2 + (y + 3)2 = 9; circle, radius 3,
center at (0, -3) in rectangular
coordinates
C. x = -6; vertical line 6 units
to the left of the pole
D. (x + 3)2 + y2 = 9; circle, radius 3
center at (-3, 0) in rectangular
coordinates
Solve the problem.The bar graph below gives the number of births in a certain state for the months October to April, where 
corresponds to October and t = 7 corresponds to April. If the number of births in thousands in this state is the function B(t), where t is in months, find B(4) and explain its meaning. 
A. 1.872; In January, there were 1872 births in this state. B. 1.956; In February, there were 1956 births in this state. C. 1.872; In January, there were 1.872 births in this state. D. 1.887; In December, there were 1887 births in this state.