Solve the indicated systems of equations graphically.The power developed in an electric resistor is i2R, where i is the current and R is the the resistance. If a first current passes through a 
resistor and a second current passes through a 
resistor, the total power produced is 15 W. If the resistors are reversed, the total power produced is 18 W. Find the currents (in A) if 
A. 1.8 A, 0.6 A
B. 5.5 A, 1.3 A
C. 0.9 A, 307.0 A
D. 0.6 A, 163.9 A
Answer: A
Mathematics
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Multiply.
A. 49x2 - 
x - 
B. 49x2 + 
C. 7x2 - 
D. 49x2 - 
Mathematics
Evaluate.6 - 9x for x = -8
A. 78 B. 5 C. -66 D. -11
Mathematics
Solve the equation by completing the square.x2 + 4x = 7
A. {-2 - 
, -2 + 
}
B. {-1 - 
, -1 + 
}
C. {-2 - 2
, -2 + 2
}
D. { 2 + 
}
Mathematics
Factor completely. If the polynomial cannot be factored, say it is prime.20x2 + 15xy - 16xy - 12y2
A. (5x + 4y)(4x + 3y) B. (20x - 4y)(x + 3y) C. (5x - 4y)(4x + 3y) D. (5x - 4)(4x + 3)
Mathematics