Find an equation of the parabola described.Focus at (0, -7); directrix the line y = 7
A. y2 = -28x
B. y2 = -7x
C. x2 = 28y
D. x2 = -28y
Answer: D
Mathematics
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Use scientific notation to perform the following operations. Leave your answer in scientific notation.(10 × 104) ÷ (5 × 106)
A. -2.0 × 102 B. 2.0 × 10-2 C. -2.0 × 10-2 D. 2.0 × 102
Mathematics
Solve the problem.Estimate 16% of 51.
A. 51.16 B. 3.19 C. 816 D. 8.16
Mathematics
Write the equation in standard form for an ellipse centered at (h, k). Identify the center and the vertices.36x2 + y2 - 648x + 2880 = 0
A. C(6, 0); V(6, ±9); 
+ 
= 1
B. C(6, 0); V(9, ±6); 
+ 
= 1
C. C(0, 9); V(±6, 9); 
+ 
= 1
D. C(9, 0); V(9, ±6); 
+ 
= 1
Mathematics
Refer to the figure with B the midpoint of side AC and E the midpoint of side DF.
If 2 CDx =?, 22 AFx =?, AND 4 BEx =+, find x. ____________________
Mathematics