Identify whether the equation is a linear equation in two variables. Answer "is" or "is not."0.09x - 0.04y = 3.1
A. is
B. is not
Answer: A
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Make an analysis using calculus and sketch the graph.F(x) = 
A. 
B. 
C. 
D. 
Solve the problem.In 2012, a certain country recovered 26% of its municipal solid wastes through recycling, up from 17% in 2007. Let P represent the percentage recycled and t the number of years since 2007. Find a linear equation for P as a function of t.
A. P = 1.8t + 24 B. P = 1.8t + 17 C. P = 0.9t - 17 D. P = -1.8t + 7
For points 
in quadrant IV, the ratio 
is always negative because x is always positive and y is always negative. In what other quadrant is the ratio
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Find the focus and directrix of the parabola.x2 + 16y = 0
A. F: (0, -4); D: x = 4 B. F: (0, -4); D: y = -4 C. F: (0, -4); D: y = 4 D. F: (-4, 0); D: y = 4