Refer to the graph of the linear function defined by 
or the graph of the linear functions defined by 
and 
to solve the equation or inequality.
f(x) < 0
A. (-5, ?)
B. (-4, ?)
C. (-?, -5)
D. (-?, -4)
Answer: A
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Solve the problem. Round your answer, if appropriate.Electrical systems are governed by Ohm's law, which states that V = IR, where V = voltage, I = current, and R = resistance. If the current in an electrical system is decreasing at a rate of 3 A/s while the voltage remains constant at 28 V, at what rate is the resistance increasing (in ?/sec) when the current is 20 A? (Do not round your answer.)
A. 
?/sec
B. 
?/sec
C. 
?/sec
D. 
?/sec
Find the area of the shaded region.
A. 
B. 3
C. 
D. 5
Determine whether the graph opens upward or downward.y = x2 - 5
A. Upward B. Downward
Find the length of the unknown side of a right triangle with legs a and b and hypotenuse c. Round to the nearest thousandth, if necessary.a = 4, b = 5
A. c = 20 B. c = 9 C. c = 6.403 D. c = 4.243