Solve the system by the addition method.x + y = -1x - y = 14
A. {(6.5, -7.5)}
B. {(1, 6.5)}
C. {(1, -7.5)}
D. {(6.5, 7.5)}
Answer: A
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Solve the problem.If a satellite reaches a speed of 7.91 kilometers per second, it will attain a circular orbit. If a satellite is placed in an orbit of 370 kilometers above the Earth, what is the equation of the path of the satellite if the origin is placed at the center of the Earth (the diameter of the Earth is approximately 12,740 kilometers)?
A. x2 + y2 = 136,900 B. x2 + y2 = 45,427,600 C. x2 + y2 = 171,872,100 D. x2 + y2 = 40,576,900
Solve the polynomial equation. In order to obtain the first root, use synthetic division to test the possible rational roots. 3x4 + 28x3 + 102x2 + 148x + 39 = 0
A. {3, - 
, -3 + 2i, -3 - 2i}
B. {-3, + 
, -2 + 3i, -2 - 3i}
C. {3, + 
, -2 + 3i, -2 - 3i}
D. {-3, - 
, -3 + 2i, -3 - 2i}
Find the standard form of the equation for the ellipse satisfying the given conditions. Foci (±9, 0); y-intercepts ±12
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Radium - 221 has a half-life of 30 s. Suppose we have a 300 g sample. (a) Find a formula for the mass remaining after t seconds. (b) How much of the sample remains after 200 seconds? (c) After how long will only 20 g remain?
What will be an ideal response?