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 4 A/s while the voltage remains constant at 18 V, at what rate is the resistance increasing (in ?/sec) when the current is 60 A? (Do not round your answer.)
A. 
?/sec
B. 
?/sec
C. 
?/sec
D. 
?/sec
Answer: B
Mathematics
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Multiply the rational expressions. Simplify, if necessary.
? 
A. 
B. 
C. 
D. 
Mathematics
Use properties of real numbers to evaluate the expression mentally.
(51) + 
(-9)
A. 
B. 70
C. 35
D. 50
Mathematics
Find the vertex, focus, and directrix of the parabola. Graph the equation.(y - 3)2 = 4(x - 2)
A. vertex: (2, 3)
focus: (3, 3)
directrix: x = 1
B. vertex: (2, 3)
focus: (2, 4)
directrix: y = 2
C. vertex: (-3, -2)
focus: (-2, -2)
directrix: x = -4
D. vertex: (-2, -3)
focus: (-2, -2)
directrix: y = -4
Mathematics
Find the value of the exponential expression.212
A. 42 B. 441 C. 23 D. 882
Mathematics