Graph the solution set of the following system of inequalities and find the coordinates of points where any lines intersect.
A. 
B. 
C. 
D. 
Answer: A
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Use the vertical line test to determine if y is a function of x.
A. Function B. Not a function
Solve the problem.The number of people present at a stadium holding a big rock concert can be estimated with the following function: 
where y is the number of people present and x is the amount of time since 
on the day of the concert. Rewrite the model with x equal to the amount of time since 1.00 p.m.
A. y = 13,252(x + 2)0.74 + 0.54(x + 2) + 102
B. y = 13,252(x + 2)0.74 + 0.54x + 102
C. 
D. y = 13,252(x - 2)0.74 + 0.54x + 102
Solve the variation problem.The intensity I of light varies inversely as the square of the distance D from the source. If the intensity of illumination on a screen 5 feet from a light is 3 foot candles, find the intensity on a screen 20 ft from the light.
A. 
foot-candles
B. 
foot-candles
C. 2 foot-candles
D. 1
foot-candles
Add.
x2 - 
x + 
A. 
x2 - 
x + 
B. 
x2 - 
x + 
C. 
x2 + 
x + 
D. 
x2 + 
x + 