Find an equation for the line with the given properties.Parallel to the line 5x - y = 4; containing the point (0, 0)
A. y = 5x
B. y = 
x
C. y = - 
x + 4
D. y = - 
x
Answer: A
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Solve the problem.The energy E (measured in joules) released by an earthquake of magnitude M on the Richter scale 
is given by the equation 
. Suppose an earthquake registers 7 on the Richter scale. Let I0 = 1. What is the intensity of the earthquake?
A. I = 1014.9 B. I = 107 C. I = 14.910 D. I = 710
Solve the equation. Express radicals in simplest form.
x2 + 
x - 
= 0
A. {-1}
B. ?
C. 
D. 
Solve the problem.An electronics company kept comparative statistics on two products, A and B. For the years 2003 to 2011, the total number of Product A ever sold (in thousands) is given by the equation 
, where x is the number of years since 2003. For that same period, the total number of Product B ever sold (in thousands) is given by the equation y = -30x + 434, where x is the number of years since 2003. Use the substitution method to solve the system and choose the statement that most accurately describes the solution.
A. The company sold about 1.8 times as many of Product B as Product A. B. At some point between 2003 and 2011, the company had sold 1800 of each product. C. At about 1.8 years (to the nearest tenth) since 2003, the company sold the same number of Product A as Product B. D. When 383,000 of Product A had been sold, 1.8 times as many of Product B had been sold.
Find an equation for the parabola described.Vertex at (6, 2); focus at (6, 4)
A. (y - 2)2 = -8(x - 6) B. (y - 2)2 = 8(x - 6) C. (x - 6)2 = -8(y - 2) D. (x - 6)2 = 8(y - 2)